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Title: Ejection of Quasi-Free-Electron Pairs from the Helium-Atom Ground State by Single-Photon Absorption

Abstract

We investigate the single-photon double ionization of helium at photon energies of 440 and 800 eV. We observe doubly charged ions with close to zero momentum corresponding to electrons emitted back to back with equal energy. These slow ions are the unique fingerprint of an elusive quasifree photon double ionization mechanism predicted by Amusia et al. nearly four decades ago. It results from the nondipole part of the electromagnetic interaction. Our experimental data are supported by calculations performed using the convergent close-coupling and time-dependent close-coupling methods.

Authors:
 [1];  [2];  [3];  [3];  [3];  [3];  [4];  [1];  [4];  [4];  [5];  [6];  [7];  [8];  [3];  [3];  [1]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. Frankfurt (Germany)
  3. Univ. Frankfurt (Germany)
  4. Auburn Univ., AL (United States)
  5. Kansas State Univ., Manhattan, KS (United States)
  6. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  7. Australian National Univ., Canberra, ACT (Australia)
  8. Curtin Univ., Perth (Australia)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Chemical Sciences, Geosciences & Biosciences Division (SC-22.1); USDOE
OSTI Identifier:
1511365
Alternate Identifier(s):
OSTI ID: 1104426
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 111; Journal Issue: 1; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS

Citation Formats

Schöffler, M. S., Stuck, C., Waitz, M., Trinter, F., Jahnke, T., Lenz, U., Jones, M., Belkacem, A., Landers, A. L., Pindzola, M. S., Cocke, C. L., Colgan, J., Kheifets, A., Bray, I., Schmidt-Böcking, H., Dörner, R., and Weber, Th. Ejection of Quasi-Free-Electron Pairs from the Helium-Atom Ground State by Single-Photon Absorption. United States: N. p., 2013. Web. doi:10.1103/PhysRevLett.111.013003.
Schöffler, M. S., Stuck, C., Waitz, M., Trinter, F., Jahnke, T., Lenz, U., Jones, M., Belkacem, A., Landers, A. L., Pindzola, M. S., Cocke, C. L., Colgan, J., Kheifets, A., Bray, I., Schmidt-Böcking, H., Dörner, R., & Weber, Th. Ejection of Quasi-Free-Electron Pairs from the Helium-Atom Ground State by Single-Photon Absorption. United States. doi:10.1103/PhysRevLett.111.013003.
Schöffler, M. S., Stuck, C., Waitz, M., Trinter, F., Jahnke, T., Lenz, U., Jones, M., Belkacem, A., Landers, A. L., Pindzola, M. S., Cocke, C. L., Colgan, J., Kheifets, A., Bray, I., Schmidt-Böcking, H., Dörner, R., and Weber, Th. Mon . "Ejection of Quasi-Free-Electron Pairs from the Helium-Atom Ground State by Single-Photon Absorption". United States. doi:10.1103/PhysRevLett.111.013003. https://www.osti.gov/servlets/purl/1511365.
@article{osti_1511365,
title = {Ejection of Quasi-Free-Electron Pairs from the Helium-Atom Ground State by Single-Photon Absorption},
author = {Schöffler, M. S. and Stuck, C. and Waitz, M. and Trinter, F. and Jahnke, T. and Lenz, U. and Jones, M. and Belkacem, A. and Landers, A. L. and Pindzola, M. S. and Cocke, C. L. and Colgan, J. and Kheifets, A. and Bray, I. and Schmidt-Böcking, H. and Dörner, R. and Weber, Th.},
abstractNote = {We investigate the single-photon double ionization of helium at photon energies of 440 and 800 eV. We observe doubly charged ions with close to zero momentum corresponding to electrons emitted back to back with equal energy. These slow ions are the unique fingerprint of an elusive quasifree photon double ionization mechanism predicted by Amusia et al. nearly four decades ago. It results from the nondipole part of the electromagnetic interaction. Our experimental data are supported by calculations performed using the convergent close-coupling and time-dependent close-coupling methods.},
doi = {10.1103/PhysRevLett.111.013003},
journal = {Physical Review Letters},
number = 1,
volume = 111,
place = {United States},
year = {2013},
month = {7}
}

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Figures / Tables:

FIG. 1 FIG. 1: (a) Sketch of the dipole structure, different planes and coordinates: light propagation x, light polarization z, gas jet direction y. (b) Slice (|more » $p$$y$| < 0.73$a$.$u$.) of the ion momentum distribution in the x,z-plane for $\hbar v$ = 800 eV. (c-h) Ion momentum distribution perpendicular to the light polarization vector for $\hbar v$ = 440 eV (left column) and $\hbar v$ = 800 eV (right column), with different cut widths along the momentum component parallel to the polarization vector of the doubly charged ion at a given photon energy ($p$$z$) (c,d) |$p$$z$/$p$$max$| ≤7%, (e,f) |$p$$z$/$p$$max$| ≤ 15%, (g,h) |$p$$z$/$p$$max$| ≤ 25%. The solid circular line represents the maximum possible momentum ($p$$max$). The dashed green line in b-d represents ($p_{single}$), the case if one electron receives all momentum. (i,j) show a momentum cut of (g,h) |$p_{y}$/$p_{max}$| ≤ 25% indicated by the yellow bars. The various lines show TDCC calculations for dipole (dashed and red), quadrupole (dotted and green) as well as the coherent sum of dipole and quadrupole (blue and solid).« less

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<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2007-01-01">January 2007</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Drukarev, Evgenii G.</span> </li> <li> Physics-Uspekhi, Vol. 50, Issue 8</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1070/PU2007v050n08ABEH006372" class="text-muted" target="_blank" rel="noopener noreferrer">10.1070/PU2007v050n08ABEH006372<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1016/j.physrep.2012.07.002" target="_blank" rel="noopener noreferrer" class="name">Electron- and photon-impact atomic ionisation<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2012-11-01">November 2012</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Bray, I.; Fursa, D. V.; Kadyrov, A. S.</span> </li> <li> Physics Reports, Vol. 520, Issue 3</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1016/j.physrep.2012.07.002" class="text-muted" target="_blank" rel="noopener noreferrer">10.1016/j.physrep.2012.07.002<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1088/0031-8949/72/6/N01" target="_blank" rel="noopener noreferrer" class="name">Quasifree Mechanism in Ionization Processes<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2005-01-01">January 2005</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Amusia, M. Ya; Drukarev, E. G.; Mandelzweig, V. B.</span> </li> <li> Physica Scripta, Vol. 72, Issue 6</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1088/0031-8949/72/6/N01" class="text-muted" target="_blank" rel="noopener noreferrer">10.1088/0031-8949/72/6/N01<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1103/PhysRevLett.77.1024" target="_blank" rel="noopener noreferrer" class="name">Fully Differential Cross Sections for Double Photoionization of He Measured by Recoil Ion Momentum Spectroscopy<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="1996-08-01">August 1996</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Dörner, R.; Feagin, J. M.; Cocke, C. L.</span> </li> <li> Physical Review Letters, Vol. 77, Issue 6</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1103/PhysRevLett.77.1024" class="text-muted" target="_blank" rel="noopener noreferrer">10.1103/PhysRevLett.77.1024<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1103/PhysRevLett.89.073002" target="_blank" rel="noopener noreferrer" class="name">Separation and Identification of Dominant Mechanisms in Double Photoionization<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2002-07-01">July 2002</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Schneider, Tobias; Chocian, Peter Leszek; Rost, Jan-Michael</span> </li> <li> Physical Review Letters, Vol. 89, Issue 7</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1103/PhysRevLett.89.073002" class="text-muted" target="_blank" rel="noopener noreferrer">10.1103/PhysRevLett.89.073002<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1103/PhysRevA.47.R16" target="_blank" rel="noopener noreferrer" class="name">High-energy behavior of the double photoionization of helium from 2 to 12 keV<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="1993-01-01">January 1993</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Levin, J. C.; Sellin, I. A.; Johnson, B. M.</span> </li> <li> Physical Review A, Vol. 47, Issue 1</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1103/PhysRevA.47.R16" class="text-muted" target="_blank" rel="noopener noreferrer">10.1103/PhysRevA.47.R16<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1103/PhysRevLett.74.4615" target="_blank" rel="noopener noreferrer" class="name">Separation of Photoabsorption and Compton Scattering Contributionsto He Single and Double Ionization<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="1995-06-01">June 1995</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Spielberger, L.; Jagutzki, O.; Dörner, R.</span> </li> <li> Physical Review Letters, Vol. 74, Issue 23</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1103/PhysRevLett.74.4615" class="text-muted" target="_blank" rel="noopener noreferrer">10.1103/PhysRevLett.74.4615<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1088/0953-4075/28/4/007" target="_blank" rel="noopener noreferrer" class="name">Selection rules for transitions to two-electron continuum states<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="1995-02-28">February 1995</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Maulbetsch, F.; Briggs, J. S.</span> </li> <li> Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 28, Issue 4</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1088/0953-4075/28/4/007" class="text-muted" target="_blank" rel="noopener noreferrer">10.1088/0953-4075/28/4/007<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1103/PhysRevA.51.R2684" target="_blank" rel="noopener noreferrer" class="name">Breakdown of asymptotics of the double photoionization of helium at the high-energy limit<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="1995-04-01">April 1995</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Drukarev, E. G.</span> </li> <li> Physical Review A, Vol. 51, Issue 4</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1103/PhysRevA.51.R2684" class="text-muted" target="_blank" rel="noopener noreferrer">10.1103/PhysRevA.51.R2684<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1103/PhysRev.108.1256" target="_blank" rel="noopener noreferrer" class="name">Radiative Corrections to the Ground-State Energy of the Helium Atom<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="1957-12-01">December 1957</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Kabir, P. K.; Salpeter, E. E.</span> </li> <li> Physical Review, Vol. 108, Issue 5</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1103/PhysRev.108.1256" class="text-muted" target="_blank" rel="noopener noreferrer">10.1103/PhysRev.108.1256<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1016/S0370-1573(99)00109-X" target="_blank" rel="noopener noreferrer" class="name">Cold Target Recoil Ion Momentum Spectroscopy: a ‘momentum microscope’ to view atomic collision dynamics<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2000-06-01">June 2000</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Dörner, R.; Mergel, V.; Jagutzki, O.</span> </li> <li> Physics Reports, Vol. 330, Issue 2-3</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1016/S0370-1573(99)00109-X" class="text-muted" target="_blank" rel="noopener noreferrer">10.1016/S0370-1573(99)00109-X<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1088/0953-4075/42/22/225204" target="_blank" rel="noopener noreferrer" class="name">Double photoionization of helium including quadrupole radiation effects<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2009-11-05">November 2009</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Ludlow, J. A.; Colgan, J.; Lee, Teck-Ghee</span> </li> <li> Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 42, Issue 22</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1088/0953-4075/42/22/225204" class="text-muted" target="_blank" rel="noopener noreferrer">10.1088/0953-4075/42/22/225204<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1103/PhysRevLett.89.033004" target="_blank" rel="noopener noreferrer" class="name">Mechanisms of Photo Double Ionization of Helium by 530 eV Photons<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2002-06-01">June 2002</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Knapp, A.; Kheifets, A.; Bray, I.</span> </li> <li> Physical Review Letters, Vol. 89, Issue 3</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1103/PhysRevLett.89.033004" class="text-muted" target="_blank" rel="noopener noreferrer">10.1103/PhysRevLett.89.033004<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1088/1367-2630/13/9/095013" target="_blank" rel="noopener noreferrer" class="name">Matter wave optics perspective at molecular photoionization: K-shell photoionization and Auger decay of N <sub>2</sub><span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2011-09-01">September 2011</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Schöffler, M. S.; Jahnke, T.; Titze, J.</span> </li> <li> New Journal of Physics, Vol. 13, Issue 9</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1088/1367-2630/13/9/095013" class="text-muted" target="_blank" rel="noopener noreferrer">10.1088/1367-2630/13/9/095013<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1134/S0021364012130024" target="_blank" rel="noopener noreferrer" class="name">Back-to-back emission of the electrons in double photoionization of helium<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2012-09-01">September 2012</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Amusia, M. Ya.; Drukarev, E. G.; Liverts, E. Z.</span> </li> <li> JETP Letters, Vol. 96, Issue 1</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1134/S0021364012130024" class="text-muted" target="_blank" rel="noopener noreferrer">10.1134/S0021364012130024<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1088/0953-4075/33/1/201" target="_blank" rel="noopener noreferrer" class="name">Differential cross sections for photo-double-ionization of the helium atom<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="1999-12-13">December 1999</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Briggs, J. S.; Schmidt, V.</span> </li> <li> Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 33, Issue 1</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1088/0953-4075/33/1/201" class="text-muted" target="_blank" rel="noopener noreferrer">10.1088/0953-4075/33/1/201<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1088/0953-4075/38/9/026" target="_blank" rel="noopener noreferrer" class="name">Photodouble ionization and the dynamics of electron pairs in the continuum<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2005-04-25">April 2005</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Avaldi, L.; Huetz, A.</span> </li> <li> Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 38, Issue 9</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1088/0953-4075/38/9/026" class="text-muted" target="_blank" rel="noopener noreferrer">10.1088/0953-4075/38/9/026<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1016/j.physleta.2003.08.008" target="_blank" rel="noopener noreferrer" class="name">Nondipole effects in double K-shell ionization of heliumlike ions<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2003-10-01">October 2003</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Mikhailov, A. I.; Mikhailov, I. A.; Moskalev, A. N.</span> </li> <li> Physics Letters A, Vol. 316, Issue 6</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1016/j.physleta.2003.08.008" class="text-muted" target="_blank" rel="noopener noreferrer">10.1016/j.physleta.2003.08.008<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1088/0022-3700/8/8/016" target="_blank" rel="noopener noreferrer" class="name">Two-electron photoionization of helium<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="1975-06-01">June 1975</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Amusia, M. Ya; Drukarev, E. G.; Gorshkov, V. G.</span> </li> <li> Journal of Physics B: Atomic and Molecular Physics, Vol. 8, Issue 8</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1088/0022-3700/8/8/016" class="text-muted" target="_blank" rel="noopener noreferrer">10.1088/0022-3700/8/8/016<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1103/PhysRevA.57.1906" target="_blank" rel="noopener noreferrer" class="name">Double photoionization of helium<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="1998-03-01">March 1998</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Samson, J. A. R.; Stolte, W. C.; He, Z. -X.</span> </li> <li> Physical Review A, Vol. 57, Issue 3</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1103/PhysRevA.57.1906" class="text-muted" target="_blank" rel="noopener noreferrer">10.1103/PhysRevA.57.1906<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1103/PhysRevLett.67.3764" target="_blank" rel="noopener noreferrer" class="name">Electron-energy and -angular distributions in the double photoionization of helium<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="1991-12-01">December 1991</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Wehlitz, R.; Heiser, F.; Hemmers, O.</span> </li> <li> Physical Review Letters, Vol. 67, Issue 27</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1103/PhysRevLett.67.3764" class="text-muted" target="_blank" rel="noopener noreferrer">10.1103/PhysRevLett.67.3764<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1088/0953-4075/35/23/103" target="_blank" rel="noopener noreferrer" class="name">Energy sharing and asymmetry parameters for photo double ionization of helium 100 eV above threshold in single-particle and Jacobi coordinates<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2002-11-14">November 2002</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Knapp, A.; Walter, M.; Weber, Th</span> </li> <li> Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 35, Issue 23</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1088/0953-4075/35/23/103" class="text-muted" target="_blank" rel="noopener noreferrer">10.1088/0953-4075/35/23/103<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1103/PhysRevA.71.052702" target="_blank" rel="noopener noreferrer" class="name">Nondipole effects in the triply differential cross section for double photoionization of He<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2005-05-01">May 2005</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Istomin, Andrei Y.; Manakov, N. L.; Meremianin, A. V.</span> </li> <li> Physical Review A, Vol. 71, Issue 5</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1103/PhysRevA.71.052702" class="text-muted" target="_blank" rel="noopener noreferrer">10.1103/PhysRevA.71.052702<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1016/S0168-9002(01)01839-3" target="_blank" rel="noopener noreferrer" class="name">A broad-application microchannel-plate detector system for advanced particle or photon detection tasks: large area imaging, precise multi-hit timing information and high detection rate<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2002-01-01">January 2002</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Jagutzki, O.; Mergel, V.; Ullmann-Pfleger, K.</span> </li> <li> Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 477, Issue 1-3</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1016/S0168-9002(01)01839-3" class="text-muted" target="_blank" rel="noopener noreferrer">10.1016/S0168-9002(01)01839-3<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1088/0953-4075/30/19/004" target="_blank" rel="noopener noreferrer" class="name">Recoil ion and electronic angular asymmetry parameters for photo double ionization of helium at 99 eV<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="1997-10-14">October 1997</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Bräuning, H.; Dörner, R.; Cocke, C. L.</span> </li> <li> Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 30, Issue 19</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1088/0953-4075/30/19/004" class="text-muted" target="_blank" rel="noopener noreferrer">10.1088/0953-4075/30/19/004<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1238/Physica.Topical.110a00083" target="_blank" rel="noopener noreferrer" class="name">(e,2e) and (?,2e) Processes: Open and Closed Questions<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2004-01-01">January 2004</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> , </span> </li> <li> Physica Scripta, Vol. 110</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1238/Physica.Topical.110a00083" class="text-muted" target="_blank" rel="noopener noreferrer">10.1238/Physica.Topical.110a00083<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1103/PhysRev.156.142" target="_blank" rel="noopener noreferrer" class="name">Double Electron Ejection Resulting from Photo-Ionization in the Outermost Shell of He, Ne, and Ar, and Its Relationship to Electron Correlation<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="1967-04-01">April 1967</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Carlson, Thomas A.</span> </li> <li> Physical Review, Vol. 156, Issue 1</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1103/PhysRev.156.142" class="text-muted" target="_blank" rel="noopener noreferrer">10.1103/PhysRev.156.142<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1103/PhysRevA.85.023418" target="_blank" rel="noopener noreferrer" class="name">Effects of photon momentum in nonrelativistic <math display="inline"> <mrow> <mo>(</mo> <mi>γ</mi> <mo>,</mo> <mn>2</mn> <mi>e</mi> <mo>)</mo> </mrow> </math> processes<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2012-02-01">February 2012</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Galstyan, A. G.; Chuluunbaatar, O.; Popov, Yu. V.</span> </li> <li> Physical Review A, Vol. 85, Issue 2</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1103/PhysRevA.85.023418" class="text-muted" target="_blank" rel="noopener noreferrer">10.1103/PhysRevA.85.023418<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1103/PhysRev.156.35" target="_blank" rel="noopener noreferrer" class="name">Theory of X-Ray Satellites<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="1967-04-01">April 1967</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Åberg, Teijo</span> </li> <li> Physical Review, Vol. 156, Issue 1</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1103/PhysRev.156.35" class="text-muted" target="_blank" rel="noopener noreferrer">10.1103/PhysRev.156.35<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1088/0370-1328/76/1/307" target="_blank" rel="noopener noreferrer" class="name">The Lamb Shift of Helium<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="1960-07-01">July 1960</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Dalgarno, A.; Stewart, A. L.</span> </li> <li> Proceedings of the Physical Society, Vol. 76, Issue 1</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1088/0370-1328/76/1/307" class="text-muted" target="_blank" rel="noopener noreferrer">10.1088/0370-1328/76/1/307<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1103/PhysRevA.67.022709" target="_blank" rel="noopener noreferrer" class="name">Characterization of high-energy photoionization in terms of the singularities of the atomic potential. I. Photoionization of the ground state of a two-electron atom<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2003-02-01">February 2003</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Surić, T.; Drukarev, E. G.; Pratt, R. H.</span> </li> <li> Physical Review A, Vol. 67, Issue 2</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1103/PhysRevA.67.022709" class="text-muted" target="_blank" rel="noopener noreferrer">10.1103/PhysRevA.67.022709<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1103/PhysRevA.48.R875" target="_blank" rel="noopener noreferrer" class="name">Double ionization of helium by a single photon with energy 89–140 eV<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="1993-08-01">August 1993</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Proulx, Daniel; Shakeshaft, Robin</span> </li> <li> Physical Review A, Vol. 48, Issue 2</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1103/PhysRevA.48.R875" class="text-muted" target="_blank" rel="noopener noreferrer">10.1103/PhysRevA.48.R875<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1103/PhysRevLett.92.063002" target="_blank" rel="noopener noreferrer" class="name">Nondipole Effects in Photo-Double-Ionization of He by a vuv Photon<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2004-02-01">February 2004</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Istomin, Andrei Y.; Manakov, N. L.; Meremianin, A. V.</span> </li> <li> Physical Review Letters, Vol. 92, Issue 6</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1103/PhysRevLett.92.063002" class="text-muted" target="_blank" rel="noopener noreferrer">10.1103/PhysRevLett.92.063002<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1088/0034-4885/66/9/203" target="_blank" rel="noopener noreferrer" class="name">Recoil-ion and electron momentum spectroscopy: reaction-microscopes<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2003-08-14">August 2003</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Ullrich, J.; Moshammer, R.; Dorn, A.</span> </li> <li> Reports on Progress in Physics, Vol. 66, Issue 9</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1088/0034-4885/66/9/203" class="text-muted" target="_blank" rel="noopener noreferrer">10.1088/0034-4885/66/9/203<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1016/S0168-9002(01)01843-5" target="_blank" rel="noopener noreferrer" class="name">Position sensitive anodes for MCP read-out using induced charge measurement<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2002-01-01">January 2002</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Jagutzki, O.; Lapington, J. S.; Worth, L. B. C.</span> </li> <li> Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 477, Issue 1-3</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1016/S0168-9002(01)01843-5" class="text-muted" target="_blank" rel="noopener noreferrer">10.1016/S0168-9002(01)01843-5<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1088/0953-4075/30/13/006" target="_blank" rel="noopener noreferrer" class="name">Recoil-ion momentum spectroscopy<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="1997-07-14">July 1997</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Ullrich, J.; Moshammer, R.; Dörner, R.</span> </li> <li> Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 30, Issue 13</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1088/0953-4075/30/13/006" class="text-muted" target="_blank" rel="noopener noreferrer">10.1088/0953-4075/30/13/006<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1088/0953-4075/38/6/001" target="_blank" rel="noopener noreferrer" class="name">Photo double ionization of helium 100 eV and 450 eV above threshold: I. Linearly polarized light<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2005-03-08">March 2005</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Knapp, A.; Kheifets, A.; Bray, I.</span> </li> <li> Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 38, Issue 6</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1088/0953-4075/38/6/001" class="text-muted" target="_blank" rel="noopener noreferrer">10.1088/0953-4075/38/6/001<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1088/0953-4075/38/6/002" target="_blank" rel="noopener noreferrer" class="name">Photo double ionization of helium 100 eV and 450 eV above threshold: II. Circularly polarized light<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2005-03-08">March 2005</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Knapp, A.; Kheifets, A.; Bray, I.</span> </li> <li> Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 38, Issue 6</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1088/0953-4075/38/6/002" class="text-muted" target="_blank" rel="noopener noreferrer">10.1088/0953-4075/38/6/002<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1088/0953-4075/34/8/102" target="_blank" rel="noopener noreferrer" class="name">On different mechanisms of the two-electron atomic photoionization<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2001-03-27">March 2001</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Kheifets, Anatoli</span> </li> <li> Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 34, Issue 8</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1088/0953-4075/34/8/102" class="text-muted" target="_blank" rel="noopener noreferrer">10.1088/0953-4075/34/8/102<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1088/0953-4075/38/6/003" target="_blank" rel="noopener noreferrer" class="name">Photo double ionization of helium 100 eV and 450 eV above threshold: III. Gerade and ungerade amplitudes and their relative phases<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2005-03-08">March 2005</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Knapp, A.; Krässig, B.; Kheifets, A.</span> </li> <li> Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 38, Issue 6</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1088/0953-4075/38/6/003" class="text-muted" target="_blank" rel="noopener noreferrer">10.1088/0953-4075/38/6/003<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1103/PhysRevA.69.032703" target="_blank" rel="noopener noreferrer" class="name">Nonrelativistic double photoeffect on <em>K</em> -shell electrons<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2004-03-01">March 2004</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Mikhailov, A. I.; Mikhailov, I. A.; Moskalev, A. N.</span> </li> <li> Physical Review A, Vol. 69, Issue 3</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1103/PhysRevA.69.032703" class="text-muted" target="_blank" rel="noopener noreferrer">10.1103/PhysRevA.69.032703<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1088/0953-4075/36/12/304" target="_blank" rel="noopener noreferrer" class="name">On the distribution of electrons in the double ionization of helium-like ions by Compton scattering<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2003-06-03">June 2003</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Amusia, M. Ya; Drukarev, E. G.</span> </li> <li> Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 36, Issue 12</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1088/0953-4075/36/12/304" class="text-muted" target="_blank" rel="noopener noreferrer">10.1088/0953-4075/36/12/304<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> </div> <div class="pagination-container small"> <a class="pure-button prev page" href="#" rel="prev"><span class="fa fa-angle-left"></span></a><ul class="pagination d-inline-block" style="padding-left:.2em;"></ul><a class="pure-button next page" href="#" rel="next"><span class="fa fa-angle-right"></span></a> </div> </div> </div> <div class="col-sm-3 order-sm-3"> <ul class="nav nav-stacked"> <li class="active"><a href="" class="reference-type-filter tab-nav" data-tab="biblio-references" data-filter="type" data-pattern="*"><span class="fa fa-angle-right"></span> All References</a></li> <li class="small" style="margin-left:.75em; 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float:none;">[ × clear filter / sort ]</a> </div> </form> </div> </div> </div> </section> <section id="biblio-citations" class="tab-content tab-content-sec osti-curated" data-tab="biblio"> <div class="row"> <div class="col-sm-9 order-sm-9"> <div class="padding"> <p class="lead text-muted" style="font-size: 18px; margin-top:0px;">Works referencing / citing this record:</p> <div class="list"> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1103/physrevlett.120.133202" target="_blank" rel="noopener noreferrer" class="name">Near- <math display="inline"> <mi>K</mi> </math> -Edge Double and Triple Detachment of the <math display="inline"> <mrow> <msup> <mrow> <mi mathvariant="normal">F</mi> </mrow> <mrow> <mo>−</mo> </mrow> </msup> </mrow> </math> Negative Ion: Observation of Direct Two-Electron Ejection by a Single Photon<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2018-03-01">March 2018</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Müller, A.; Borovik, A.; Bari, S.</span> </li> <li> Physical Review Letters, Vol. 120, Issue 13</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1103/physrevlett.120.133202" class="text-muted" target="_blank" rel="noopener noreferrer">10.1103/physrevlett.120.133202<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1103/physrevlett.121.173003" target="_blank" rel="noopener noreferrer" class="name">Separating Dipole and Quadrupole Contributions to Single-Photon Double Ionization<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2018-10-01">October 2018</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Grundmann, S.; Trinter, F.; Bray, A. W.</span> </li> <li> Physical Review Letters, Vol. 121, Issue 17</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1103/physrevlett.121.173003" class="text-muted" target="_blank" rel="noopener noreferrer">10.1103/physrevlett.121.173003<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1142/s0217984918500835" target="_blank" rel="noopener noreferrer" class="name">Hubbard model analysis of the double photoionization of aromatic hydrocarbons<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2018-02-28">February 2018</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Huber, D. L.</span> </li> <li> Modern Physics Letters B, Vol. 32, Issue 06</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1142/s0217984918500835" class="text-muted" target="_blank" rel="noopener noreferrer">10.1142/s0217984918500835<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1103/physrevlett.120.133202" target="_blank" rel="noopener noreferrer" class="name">Near- <math display="inline"> <mi>K</mi> </math> -Edge Double and Triple Detachment of the <math display="inline"> <mrow> <msup> <mrow> <mi mathvariant="normal">F</mi> </mrow> <mrow> <mo>−</mo> </mrow> </msup> </mrow> </math> Negative Ion: Observation of Direct Two-Electron Ejection by a Single Photon<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2018-03-01">March 2018</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Müller, A.; Borovik, A.; Bari, S.</span> </li> <li> Physical Review Letters, Vol. 120, Issue 13</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1103/physrevlett.120.133202" class="text-muted" target="_blank" rel="noopener noreferrer">10.1103/physrevlett.120.133202<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1142/s0217984918500835" target="_blank" rel="noopener noreferrer" class="name">Hubbard model analysis of the double photoionization of aromatic hydrocarbons<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2018-02-28">February 2018</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Huber, D. L.</span> </li> <li> Modern Physics Letters B, Vol. 32, Issue 06</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1142/s0217984918500835" class="text-muted" target="_blank" rel="noopener noreferrer">10.1142/s0217984918500835<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.3204/pubdb-2018-04884" target="_blank" rel="noopener noreferrer" class="name">Separating Dipole and Quadrupole Contributions to Single-Photon Double Ionization<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">text</span>, <span class="date" data-date="2018-01-01">January 2018</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Grundmann, Sven; Trinter, Florian; Bray, A. W.</span> </li> <li> Deutsches Elektronen-Synchrotron, DESY, Hamburg</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.3204/pubdb-2018-04884" class="text-muted" target="_blank" rel="noopener noreferrer">10.3204/pubdb-2018-04884<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1103/physrevlett.121.173003" target="_blank" rel="noopener noreferrer" class="name">Separating Dipole and Quadrupole Contributions to Single-Photon Double Ionization<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2018-10-01">October 2018</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Grundmann, S.; Trinter, F.; Bray, A. W.</span> </li> <li> Physical Review Letters, Vol. 121, Issue 17</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1103/physrevlett.121.173003" class="text-muted" target="_blank" rel="noopener noreferrer">10.1103/physrevlett.121.173003<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1038/s41598-019-53545-z" target="_blank" rel="noopener noreferrer" class="name">Parametrization of energy sharing distributions in direct double photoionization of He<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2019-11-29">November 2019</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Andersson, J.; Zagorodskikh, S.; Roos, A. Hult</span> </li> <li> Scientific Reports, Vol. 9, Issue 1</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1038/s41598-019-53545-z" class="text-muted" target="_blank" rel="noopener noreferrer">10.1038/s41598-019-53545-z<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1088/1361-6455/aab195" target="_blank" rel="noopener noreferrer" class="name">A practical theoretical formalism for atomic multielectron processes: direct multiple ionization by a single auger decay or by impact of a single electron or photon<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2018-03-16">March 2018</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Liu, Pengfei; Zeng, Jiaolong; Yuan, Jianmin</span> </li> <li> Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 51, Issue 7</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1088/1361-6455/aab195" class="text-muted" target="_blank" rel="noopener noreferrer">10.1088/1361-6455/aab195<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1088/1361-6455/ab3d13" target="_blank" rel="noopener noreferrer" class="name">Description of two-electron atoms with correct cusp conditions<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2019-10-04">October 2019</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Kruppa, A. T.; Kovács, J.; Hornyak, I.</span> </li> <li> Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 52, Issue 21</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1088/1361-6455/ab3d13" class="text-muted" target="_blank" rel="noopener noreferrer">10.1088/1361-6455/ab3d13<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1103/physreva.93.063421" target="_blank" rel="noopener noreferrer" class="name">Laser-subcycle control of sequential double-ionization dynamics of helium<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2016-06-01">June 2016</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Schöffler, Markus S.; Xie, Xinhua; Wustelt, Philipp</span> </li> <li> Physical Review A, Vol. 93, Issue 6</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1103/physreva.93.063421" class="text-muted" target="_blank" rel="noopener noreferrer">10.1103/physreva.93.063421<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1103/physreva.99.062711" target="_blank" rel="noopener noreferrer" class="name">Single ionization of helium by fast proton impact in different kinematical regimes<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2019-06-01">June 2019</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Chuluunbaatar, O.; Kouzakov, K. A.; Zaytsev, S. A.</span> </li> <li> Physical Review A, Vol. 99, Issue 6</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1103/physreva.99.062711" class="text-muted" target="_blank" rel="noopener noreferrer">10.1103/physreva.99.062711<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1103/physrevlett.124.043201" target="_blank" rel="noopener noreferrer" class="name">Photon Momentum Transfer in Single-Photon Double Ionization of Helium<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2020-01-01">January 2020</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Chen, Si-Ge; Jiang, Wei-Chao; Grundmann, S.</span> </li> <li> Physical Review Letters, Vol. 124, Issue 4</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1103/physrevlett.124.043201" class="text-muted" target="_blank" rel="noopener noreferrer">10.1103/physrevlett.124.043201<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1103/physrevlett.124.043203" target="_blank" rel="noopener noreferrer" class="name">Two-Electron Interference in Strong-Field Ionization of He by a Short Intense Extreme Ultraviolet Laser Pulse<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2020-01-01">January 2020</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Jiang, Wei-Chao; Chen, Si-Ge; Peng, Liang-You</span> </li> <li> Physical Review Letters, Vol. 124, Issue 4</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1103/physrevlett.124.043203" class="text-muted" target="_blank" rel="noopener noreferrer">10.1103/physrevlett.124.043203<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1103/physrevlett.124.233201" target="_blank" rel="noopener noreferrer" class="name">Observation of Photoion Backward Emission in Photoionization of He and <math display="inline"> <mrow> <msub> <mrow> <mi mathvariant="normal">N</mi> </mrow> <mrow> <mn>2</mn> </mrow> </msub> </mrow> </math><span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2020-06-01">June 2020</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Grundmann, Sven; Kircher, Max; Vela-Perez, Isabel</span> </li> <li> Physical Review Letters, Vol. 124, Issue 23</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1103/physrevlett.124.233201" class="text-muted" target="_blank" rel="noopener noreferrer">10.1103/physrevlett.124.233201<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> </div> <div class="pagination-container small"> <a class="pure-button prev page" href="#" rel="prev"><span class="fa fa-angle-left"></span></a><ul class="pagination d-inline-block" style="padding-left:.2em;"></ul><a class="pure-button next page" href="#" rel="next"><span class="fa fa-angle-right"></span></a> </div> </div> </div> <div class="col-sm-3 order-sm-3"> <ul class="nav nav-stacked"> <li class="active"><a href="" class="reference-type-filter tab-nav" data-filter="type" data-pattern="*"><span class="fa fa-angle-right"></span> All Cited By</a></li> <li class="small" style="margin-left:.75em; text-transform:capitalize;"><a href="" class="reference-type-filter tab-nav" data-filter="type" data-pattern="journal"><span class="fa fa-angle-right"></span> journal<small class="text-muted"> (14)</small></a></li> <li class="small" style="margin-left:.75em; text-transform:capitalize;"><a href="" class="reference-type-filter tab-nav" data-filter="type" data-pattern="text"><span class="fa fa-angle-right"></span> text<small class="text-muted"> (1)</small></a></li> </ul> <div style="margin-top:2em;"> <form class="pure-form small text-muted citation-search"> <label for="citation-search-text" class="sr-only">Search</label> <input class="search form-control pure-input-1" id="citation-search-text" placeholder="Search" style="margin-bottom:10px;" /> <fieldset> <div style="margin-left:1em; font-weight:normal; line-height: 1.6em;"><input type="radio" class="sort" name="references-sort" data-sort="name" style="position:relative;top:2px;" id="citation-search-sort-name"><label for="citation-search-sort-name" style="margin-left: .3em;">Sort by title</label></div> <div style="margin-left:1em; 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(b) Slice (|$p$$y$| < 0.73$a$.$u$.) of the ion momentum distribution in the x,z-plane for $\hbar v$ = 800 eV. (c-h) Ion momentum distribution perpendicular to the light polarization vector for $\hbar v$ = 440 eV (left column) and $\hbar v$ = 800 eV (right column), with different cut widths along the momentum component parallel to the polarization vector of the doubly charged ion at a given photon energy ($p$$z$) (c,d) |$p$$z$/$p$$max$| ≤7%, (e,f) |$p$$z$/$p$$max$| ≤ 15%, (g,h) |$p$$z$/$p$$max$| ≤ 25%. The solid circular line represents the maximum possible momentum ($p$$max$). The dashed green line in b-d represents ($p_{single}$), the case if one electron receives all momentum. (i,j) show a momentum cut of (g,h) |$p_{y}$/$p_{max}$| ≤ 25% indicated by the yellow bars. The various lines show TDCC calculations for dipole (dashed and red), quadrupole (dotted and green) as well as the coherent sum of dipole and quadrupole (blue and solid)." data-ostiid="1511365" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1511365-img445434" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1511365-img445434"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">FIG. 1 <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 4)</small><span class="d-none type">figure</span></small> <div style=" background-image:url('/biblio/1511365/image/001/136/0011360/1/t0445434.png'); background-repeat:no-repeat; background-size:contain; background-position-x: center; width: 100%; height: 175px; margin-top:.5em; "> </div> </div> </a> </div> <div class="col-sm-3 float-left biblio-image-tile" data-apporder="p. 4" data-order="2" data-imgid="1511365-img445435" data-imgsrc="/biblio/1511365/image/001/136/0011360/1/0445435.png" data-title="FIG. 2" data-desc="Calculations for 440 eV (left column) and 800 eV (right column) photon energy with the same geometry as in the experiment (Figure 1c,d), for a width of $Δp_{z}$/$p_{max}$ ≤ ±15%. In panels (a,b) the CCC calculations include only the dipole interaction, while (c,d) display solely the quadrupole terms and (e,f) show the full theory. The panels (g,h) show a full TDCC calculation including dipole and quadrupole terms and in contrast to CCC their interference terms." data-ostiid="1511365" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1511365-img445435" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1511365-img445435"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">FIG. 2 <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 4)</small><span class="d-none type">figure</span></small> <div style=" background-image:url('/biblio/1511365/image/001/136/0011360/1/t0445435.png'); background-repeat:no-repeat; background-size:contain; background-position-x: center; width: 100%; height: 175px; margin-top:.5em; "> </div> </div> </a> </div> </div> <div class="pagination-container small"> <a class="pure-button prev page" href="#" rel="prev"><span class="fa fa-angle-left"></span></a><ul class="pagination d-inline-block" style="padding-left:.2em;"></ul><a class="pure-button next page" href="#" rel="next"><span class="fa fa-angle-right"></span></a> </div> </div> </div> <div class="col-sm-3 order-sm-3"> <ul class="nav nav-stacked"> <li class="active"><a href="" class="reference-type-filter tab-nav" data-tab="biblio-images" data-filter="type" data-pattern="*"><span class="fa fa-angle-right"></span> All Images</a></li> <li class="small" style="margin-left:.75em; text-transform:capitalize;"><a href="" class="reference-type-filter tab-nav ga-click-event" data-tab="biblio-images" data-filter="type" data-pattern="figure" data-category="Extracted Images" data-label="biblio: image filter - figure"><span class="fa fa-angle-right"></span> figures<small class="text-muted"> (2)</small></a></li> </ul> <div style="margin-top:2em;"> <form class="pure-form small text-muted image-search"> <label for="image-search-text" class="sr-only">Search</label> <input class="search form-control pure-input-1" id="image-search-text" placeholder="Search" style="margin-bottom:10px;" /> <fieldset> <div style="margin-left:1em; font-weight:normal; line-height: 1.6em;"><input type="radio" class="sort ga-click-event" name="images-sort" data-sort="name" style="position:relative;top:2px;" id="image-search-sort-name" data-category="Extracted Images" data-label="biblio: image sort - name"><label for="image-search-sort-name" style="margin-left: .3em;">Sort by figure / table title</label></div> <div style="margin-left:1em; font-weight:normal; line-height: 1.6em;"><input type="radio" class="sort ga-click-event" name="images-sort" data-sort="order" style="position:relative;top:2px;" id="image-search-sort-date" data-category="Extracted Images" data-label="biblio: image sort - order"><label for="image-search-sort-date" style="margin-left: .3em;">Sort by page order</label></div> </fieldset> <div class="text-left" style="margin-top:1.5em;margin-left:1em;"> <a href="" class="filter-clear clearfix" title="Clear filter / sort" style="font-weight:normal; float:none;">[ × clear filter / sort ]</a> </div> </form> </div> <div class="text-muted small" style="margin-top:2em; padding:1em;"> <em>Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.</em> </div> </div> </div> </section> <section id="biblio-related" class="tab-content tab-content-sec " data-tab="biblio"> <div class="row"> <div class="col-sm-9 order-sm-9"> <section id="biblio-similar" class="tab-content tab-content-sec active" data-tab="related"> <div class="padding"> <p class="lead text-muted" style="font-size: 18px; margin-top:0px;">Similar Records in DOE PAGES and OSTI.GOV collections:</p> <aside> <ul class="item-list" itemscope itemtype="http://schema.org/ItemList" style="padding-left:0; list-style-type: none;"> <li> <div class="article item document" itemprop="itemListElement" itemscope itemtype="http://schema.org/WebPage"><meta itemprop="position" content="1" /><div class="item-info"> <h2 class="title" itemprop="name headline"><a href="/biblio/20982446-resonant-two-photon-absorption-extreme-ultraviolet-free-electron-laser-radiation-helium" itemprop="url">Resonant two-photon absorption of extreme-ultraviolet free-electron-laser radiation in helium</a></h2> <div class="metadata"> <small class="text-muted" style="text-transform:uppercase;display:block;line-height:2.5em;">Journal Article</small><span class="authors"> <span class="author">Nagasono, Mitsuru</span> ; <span class="author">Suljoti, Edlira</span> ; <span class="author">Pietzsch, Annette</span> ; <span class="author">...</span> <span class="text-muted pubdata"> - Physical Review. A</span> </span> </div> <div class="abstract">We have investigated the nonlinear response of helium to intense extreme-ultraviolet radiation from the free-electron laser in Hamburg (FLASH). We observe a spectral feature between 24 and 26 eV electron kinetic energy in photoemission which shows a quadratic fluence dependence. The feature is explained as a result of subsequent processes involving a resonant two-photon absorption process into doubly excited levels of even parity (N=5 and 6), radiative decay to the doubly excited states in the vicinity of the He{sup +} (N=2) ionization threshold and finally the photoionization of the inner electron by the radiation of the next microbunches. This observation<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> suggests that even-parity states, which have been elusive to be measured with the low pulse energy of synchrotron radiation sources, can be investigated with the intense radiation of FLASH. This also demonstrates a first step to bring nonlinear spectroscopy into the xuv and soft-x-ray regime.</span><a href='#' onclick='$(this).hide().prev().hide().prev().show();return false;' style='margin-left:10px;display:none;'>« less</a></div><div class="metadata-links small clearfix text-muted" style="margin-top:15px;"> <div class="pure-menu pure-menu-horizontal pull-right" style="width:unset;"> <ul class="pure-menu-list"> <li class="pure-menu-item"><span class="item-info-ftlink">DOI: <a class="misc doi-link " href="https://doi.org/10.1103/PHYSREVA.75.051406" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="20982446" data-product-type="Journal Article" data-product-subtype="" >10.1103/PHYSREVA.75.051406</a></span></li> </ul> </div> </div> </div> <div class="clearfix"></div> </div> </li> <li> <div class="article item document" itemprop="itemListElement" itemscope itemtype="http://schema.org/WebPage"><meta itemprop="position" content="2" /><div class="item-info"> <h2 class="title" itemprop="name headline"><a href="/biblio/21016071-angular-anisotropy-parameters-recoil-ion-momentum-distribution-two-photon-double-ionization-helium" itemprop="url">Angular anisotropy parameters and recoil-ion momentum distribution in two-photon double ionization of helium</a></h2> <div class="metadata"> <small class="text-muted" style="text-transform:uppercase;display:block;line-height:2.5em;">Journal Article</small><span class="authors"> <span class="author">Kheifets, A S</span> ; <span class="author">Ivanov, I A</span> ; <span class="author">Bray, Igor</span> <span class="text-muted pubdata"> - Physical Review. A</span> </span> </div> <div class="abstract">We present convergent-close-coupling (CCC) calculations of the angular anisotropy parameters {beta}{sub 2},{beta}{sub 4} and the recoil ion momentum distribution d{sigma}/dp in two-photon double ionization (TPDI) of helium. In a stark contrast to single-photon double ionization (SPDI), where the {beta}{sub 2} parameter varies widely changing the angular distribution from isotropic to nearly dipole for slow and fast photoelectrons, respectively, the {beta} parameters for TPDI show very little change. The angular distribution of the recoil ion is fairly isotropic in TPDI as opposed to a strong alignment with the polarization of light in SPDI.</div><div class="metadata-links small clearfix text-muted" style="margin-top:15px;"> <div class="pure-menu pure-menu-horizontal pull-right" style="width:unset;"> <ul class="pure-menu-list"> <li class="pure-menu-item"><span class="item-info-ftlink">DOI: <a class="misc doi-link " href="https://doi.org/10.1103/PHYSREVA.76.025402" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="21016071" data-product-type="Journal Article" data-product-subtype="" >10.1103/PHYSREVA.76.025402</a></span></li> </ul> </div> </div> </div> <div class="clearfix"></div> </div> </li> <li> <div class="article item document" itemprop="itemListElement" itemscope itemtype="http://schema.org/WebPage"><meta itemprop="position" content="3" /><div class="item-info"> <h2 class="title" itemprop="name headline"><a href="/biblio/20786511-parametrizations-dynamical-analysis-angle-integrated-cross-sections-double-photoionization-including-nondipole-effects" itemprop="url">Parametrizations and dynamical analysis of angle-integrated cross sections for double photoionization including nondipole effects</a></h2> <div class="metadata"> <small class="text-muted" style="text-transform:uppercase;display:block;line-height:2.5em;">Journal Article</small><span class="authors"> <span class="author">Istomin, Andrei Y</span> ; <span class="author">Starace, Anthony F</span> ; <span class="author">Manakov, N L</span> ; <span class="author">...</span> <span class="text-muted pubdata"> - Physical Review. A</span> </span> </div> <div class="abstract">Similarly to differential cross sections for one-electron photoionization, the doubly differential cross section for double photoionization (DPI) may be conveniently described by four parameters: the singly differential (with respect to energy sharing) cross section ({sigma}{sub 0}), the dipole asymmetry parameter ({beta}), and two nondipole asymmetry parameters ({gamma} and {delta}). Here we derive two model-independent representations for these parameters for DPI from a {sup 1}S{sub 0} atomic bound state: (i) in terms of one-dimensional integrals of the polarization-invariant DPI amplitudes and (ii) in terms of the exact two-electron reduced matrix elements. For DPI of He at excess energies, E{sub exc}, of<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> 100 eV, 450 eV, and 1 keV, we present numerical results for the asymmetry parameters within the framework of the convergent close-coupling theory and compare them with results of lowest-order (in the interelectron interaction) perturbation theory (LOPT). The results for E{sub exc}=1 keV exhibit a nondipole asymmetry that is large enough to be easily measured experimentally. We find excellent agreement between our LOPT results and other theoretical predictions and experimental data for total cross sections and ratios of double to single ionization cross sections for K-shell DPI from several multielectron atoms.</span><a href='#' onclick='$(this).hide().prev().hide().prev().show();return false;' style='margin-left:10px;display:none;'>« less</a></div><div class="metadata-links small clearfix text-muted" style="margin-top:15px;"> <div class="pure-menu pure-menu-horizontal pull-right" style="width:unset;"> <ul class="pure-menu-list"> <li class="pure-menu-item"><span class="item-info-ftlink">DOI: <a class="misc doi-link " href="https://doi.org/10.1103/PHYSREVA.72.0" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="20786511" data-product-type="Journal Article" data-product-subtype="" >10.1103/PHYSREVA.72.0</a></span></li> </ul> </div> </div> </div> <div class="clearfix"></div> </div> </li> <li> <div class="article item document" itemprop="itemListElement" itemscope itemtype="http://schema.org/WebPage"><meta itemprop="position" content="4" /><div class="item-info"> <h2 class="title" itemprop="name headline"><a href="/biblio/20632296-ultrarelativistic-limit-two-electron-photoionization-cross-section" itemprop="url">Ultrarelativistic limit for the two-electron photoionization cross section</a></h2> <div class="metadata"> <small class="text-muted" style="text-transform:uppercase;display:block;line-height:2.5em;">Journal Article</small><span class="authors"> <span class="author">Amusia, M Ya</span> ; <span class="author">Ioffe Physico-Technical Institute, St. Petersburg, 194021</span> ; <span class="author">Drukarev, E G</span> ; <span class="author">...</span> <span class="text-muted pubdata"> - Physical Review. A</span> </span> </div> <div class="abstract">The ratio of double- to single-electron photoionization cross section is calculated in the ultrarelativistic photon frequency region, namely where the photon energy is much larger than the electron rest mass. This ratio can be presented as a sum of the shake-off term and the quasifree term. They are expressed via essentially different integrals of the initial-state two-electron wave function. The shake-off term is calculated in the dipole approximation. The quasifree contribution is nondipole and is determined by the probability of finding both ionizing electrons at the same point in the initial state. The calculations are performed for the negative hydrogen<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> ion, the helium atom, and the heliumlike ions in the ground and excited states using high-precision nonvariational wave functions. The nuclear charge dependence of this correction for heliumlike ions in the ground and the four lowest {sup 1}S excited states is calculated. The possibility to detect the quasifree contribution experimentally is discussed.</span><a href='#' onclick='$(this).hide().prev().hide().prev().show();return false;' style='margin-left:10px;display:none;'>« less</a></div><div class="metadata-links small clearfix text-muted" style="margin-top:15px;"> <div class="pure-menu pure-menu-horizontal pull-right" style="width:unset;"> <ul class="pure-menu-list"> <li class="pure-menu-item"><span class="item-info-ftlink">DOI: <a class="misc doi-link " href="https://doi.org/10.1103/PhysRevA.66.052706" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="20632296" data-product-type="Journal Article" data-product-subtype="" >10.1103/PhysRevA.66.052706</a></span></li> </ul> </div> </div> </div> <div class="clearfix"></div> </div> </li> <li> <div class="article item document" itemprop="itemListElement" itemscope itemtype="http://schema.org/WebPage"><meta itemprop="position" content="5" /><div class="item-info"> <h2 class="title" itemprop="name headline"><a href="/biblio/55117-relationship-between-ratios-double-single-ionization-helium-photons-charged-particles" itemprop="url">Relationship between the ratios of double to single ionization of helium by photons and charged particles</a></h2> <div class="metadata"> <small class="text-muted" style="text-transform:uppercase;display:block;line-height:2.5em;">Journal Article</small><span class="authors"> <span class="author">Wang, J</span> ; <span class="author">McGuire, J H</span> ; <span class="author">Burgdoerfer, J</span> ; <span class="author">...</span> <span class="text-muted pubdata"> - Physical Review A</span> </span> </div> <div class="abstract">A relationship between ionization by photons and by energetic charged particles interacting with matter is proposed and tested. The method is based on the recognition that both dipole and nondipole transitions are allowed for charged particles. The dipole component is shown to be related to photoabsorption, and the nondipole component to Compton scattering. As an example, we calculate the ratio of double to single ionization of helium by protons in terms of the corresponding ratios for photoabsorption and Compton scattering. At a proton energy of 400 MeV, this ratio is found to be 0.272%, with the dipole component contribution 0.211%<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> and the nondipole component contributing the remaining 0.061%. The basic idea of our method may be readily extended to other many-electron processes, such as double excitation and excitation-ionization.</span><a href='#' onclick='$(this).hide().prev().hide().prev().show();return false;' style='margin-left:10px;display:none;'>« less</a></div><div class="metadata-links small clearfix text-muted" style="margin-top:15px;"> <div class="pure-menu pure-menu-horizontal pull-right" style="width:unset;"> <ul class="pure-menu-list"> <li class="pure-menu-item"><span class="item-info-ftlink">DOI: <a class="misc doi-link " href="https://doi.org/10.1103/PhysRevA.51.4687" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="55117" data-product-type="Journal Article" data-product-subtype="AC" >10.1103/PhysRevA.51.4687</a></span></li> </ul> </div> </div> </div> <div class="clearfix"></div> </div> </li> </ul> </aside> </div> </section> </div> <div class="col-sm-3 order-sm-3"> <ul class="nav nav-stacked"> <li class="active"><a class="tab-nav disabled" data-tab="related" style="color: #636c72 !important; opacity: 1;"><span class="fa fa-angle-right"></span> Similar Records</a></li> </ul> </div> </div> </section> </div></div> </div> </div> </section> <footer class="" style="background-color:#f9f9f9; /* padding-top: 0.5rem; */"> <div class="footer-minor"> <div class="container"> <hr class="footer-separator" /> <div class="text-center" style="margin-top:1.25rem;"> <div class="pure-menu pure-menu-horizontal"> <ul class="pure-menu-list" id="footer-org-menu"> <li class="pure-menu-item"> <a href="https://energy.gov" target="_blank" rel="noopener noreferrer"> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==" class="sprite sprite-footer-us-doe-min" alt="U.S. Department of Energy" /> </a> </li> <li class="pure-menu-item"> <a href="https://www.energy.gov/science/office-science" target="_blank" rel="noopener noreferrer"> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==" class="sprite sprite-footer-office-of-science-min" alt="Office of Science" /> </a> </li> <li class="pure-menu-item"> <a href="/"> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==" class="sprite sprite-footer-osti-min" alt="Office of Scientific and Technical Information" /> </a> </li> </ul> </div> </div> <div class="text-center small" style="margin-top:0.5em;margin-bottom:2.0rem;"> <div class="pure-menu pure-menu-horizontal"> <ul class="pure-menu-list"> <li class="pure-menu-item"><a href="/disclaim" class="pure-menu-link"><span class="fa fa-institution"></span> Website Policies <span class="hidden-xs">/ Important Links</span></a></li> <li class="pure-menu-item"><a href="/pages/contact" class="pure-menu-link"><span class="fa fa-comments-o"></span> Contact Us</a></li> <li class="d-block d-md-none"></li> <li class="pure-menu-item"><a href="https://www.facebook.com/ostigov" target="_blank" rel="noopener noreferrer" class="pure-menu-link social"><span class="fa fa-facebook" style=""></span></a></li> <li class="pure-menu-item"><a href="https://twitter.com/OSTIgov" target="_blank" rel="noopener noreferrer" class="pure-menu-link social"><span class="fa fa-twitter" style=""></span></a></li> <li class="pure-menu-item"><a href="https://www.youtube.com/user/ostigov" target="_blank" rel="noopener noreferrer" class="pure-menu-link social"><span class="fa fa-youtube-play" style=""></span></a></li> </ul> </div> </div> </div> </div> </footer> <link href="/pages/css/pages.fonts.200912.1307.css" rel="stylesheet"> <script src="/pages/js/pages.200912.1307.js"></script><noscript></noscript> <script defer src="/pages/js/pages.biblio.200912.1307.js"></script><noscript></noscript> <script defer src="/pages/js/lity.js"></script><noscript></noscript> <script async type="text/javascript" src="/pages/js/Universal-Federated-Analytics-Min.js?agency=DOE" id="_fed_an_ua_tag"></script><noscript></noscript> </body> <!-- DOE PAGES v.200912.1307 --> </html>