Photoionization of metastable heliumlike C4+(1s2sS13) ions: Precision study of intermediate doubly excited states

Müller, A.; Lindroth, E.; Bari, S.; Borovik, A.; Hillenbrand, P. -M.; Holste, K.; Indelicato, P.; Kilcoyne, A. L.  D.; Klumpp, S.; Martins, M.; Viefhaus, J.; Wilhelm, P.; Schippers, S.

doi:10.1103/PhysRevA.98.033416

Title: Photoionization of metastable heliumlike $C^{4 +} (1 s 2 s {}^{3}S_{1})$ ions: Precision study of intermediate doubly excited states

Abstract

In a joint experimental and theoretical endeavor, photoionization of metastable C⁴⁺(1s2s³S₁) ions via intermediate levels with hollow, double-K-vacancy configurations 2s2p, 2s3p, 2p3s, 2p3d, 2s4p, 2p4s, and 2p4d has been investigated. High-resolution photon-ion merged-beams measurements were carried out with the resolving power reaching up to 25 800 which is sufficient to separate the leading fine-structure components of the 2s2p ³P term. Many-body perturbation theory was employed to determine level-to-level cross sections for K-shell excitation with subsequent autoionization. The resonance energies were calculated with inclusion of electron correlation and radiative contributions. Their uncertainties are estimated to be below ±1 meV. Detailed balance confirms the present photoionization cross-section results by comparison with previous dielectronic-recombination measurements. Finally, the high accuracy of the theoretical transition energies together with the present experimental results qualify photoabsorption resonances in heliumlike ions as new, greatly improved energy-reference standards at synchrotron radiation facilities.

Authors:

Müller, A. ^[1]; Lindroth, E. ^[2]; Bari, S. ^[3]; Borovik, A. ^[1]; Hillenbrand, P. -M. ^[4]; Holste, K. ^[1]; Indelicato, P. ^[5]; Kilcoyne, A. L. D. ^[6]; Klumpp, S. ^[3]; Martins, M. ^[7]; Viefhaus, J. ^[8]; Wilhelm, P. ^[9]; Schippers, S. ^[1]

Justus-Liebig-Univ., Giessen (Germany)
Alba Nova Univ. Center, Stockholm (Sweden)
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
GSI Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany); Columbia Univ., New York, NY (United States)
Sorbonne Univ., Paris (France)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Univ. Hamburg (Germany)
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Helmholtz-Zentrum, Berlin (Germany)
Justus-Liebig-Univ., Giessen (Germany); Max-Planck-Inst. fur Kernphysik, Heidelberg (Germany)

Publication Date:: Tue Sep 25 00:00:00 EDT 2018

Research Org.:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Bundesministerium fur Bildung und Forschung; European Union (EU); Helmholtz Association; Swedish Research Council (SRC)

OSTI Identifier:: 1604650

Grant/Contract Number:: AC02-05CH11231; 05K10RG1; 05K10GUB; 05K16RG1; 05K16GUV; 654220; EMMI HA-216; 2016-03789

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review A

Additional Journal Information:: Journal Volume: 98; Journal Issue: 3; Journal ID: ISSN 2469-9926

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 74 ATOMIC AND MOLECULAR PHYSICS; atomic & molecular structure; autoionization & Auger processes; electronic structure of atoms & molecules; electronic transitions; relativistic & quantum electrodynamic effects in atoms, molecules, & ions; single- and few-photon ionization & excitation

Citation Formats


                    Müller, A., Lindroth, E., Bari, S., Borovik, A., Hillenbrand, P. -M., Holste, K., Indelicato, P., Kilcoyne, A. L.  D., Klumpp, S., Martins, M., Viefhaus, J., Wilhelm, P., and Schippers, S. Photoionization of metastable heliumlike C4+(1s2sS13) ions: Precision study of intermediate doubly excited states.  United States: N. p., 2018. 
Web.  doi:10.1103/PhysRevA.98.033416.

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                    Müller, A., Lindroth, E., Bari, S., Borovik, A., Hillenbrand, P. -M., Holste, K., Indelicato, P., Kilcoyne, A. L.  D., Klumpp, S., Martins, M., Viefhaus, J., Wilhelm, P., & Schippers, S. Photoionization of metastable heliumlike C4+(1s2sS13) ions: Precision study of intermediate doubly excited states.  United States.  https://doi.org/10.1103/PhysRevA.98.033416

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                    Müller, A., Lindroth, E., Bari, S., Borovik, A., Hillenbrand, P. -M., Holste, K., Indelicato, P., Kilcoyne, A. L.  D., Klumpp, S., Martins, M., Viefhaus, J., Wilhelm, P., and Schippers, S. Tue .  
"Photoionization of metastable heliumlike C4+(1s2sS13) ions: Precision study of intermediate doubly excited states".  United States.  https://doi.org/10.1103/PhysRevA.98.033416.  https://www.osti.gov/servlets/purl/1604650.

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@article{osti_1604650,

  title        = {Photoionization of metastable heliumlike C4+(1s2sS13) ions: Precision study of intermediate doubly excited states},

  author       = {Müller, A. and Lindroth, E. and Bari, S. and Borovik, A. and Hillenbrand, P. -M. and Holste, K. and Indelicato, P. and Kilcoyne, A. L.  D. and Klumpp, S. and Martins, M. and Viefhaus, J. and Wilhelm, P. and Schippers, S.},

  abstractNote = {In a joint experimental and theoretical endeavor, photoionization of metastable C4+(1s2s3S1) ions via intermediate levels with hollow, double-K-vacancy configurations 2s2p, 2s3p, 2p3s, 2p3d, 2s4p, 2p4s, and 2p4d has been investigated. High-resolution photon-ion merged-beams measurements were carried out with the resolving power reaching up to 25 800 which is sufficient to separate the leading fine-structure components of the 2s2p 3P term. Many-body perturbation theory was employed to determine level-to-level cross sections for K-shell excitation with subsequent autoionization. The resonance energies were calculated with inclusion of electron correlation and radiative contributions. Their uncertainties are estimated to be below ±1 meV. Detailed balance confirms the present photoionization cross-section results by comparison with previous dielectronic-recombination measurements. Finally, the high accuracy of the theoretical transition energies together with the present experimental results qualify photoabsorption resonances in heliumlike ions as new, greatly improved energy-reference standards at synchrotron radiation facilities.},

  doi          = {10.1103/PhysRevA.98.033416},

  journal      = {Physical Review A},

  number       = 3,

  volume       = 98,

  place        = {United States},

  year         = {Tue Sep 25 00:00:00 EDT 2018},

  month        = {Tue Sep 25 00:00:00 EDT 2018}

}

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journal, November 1977

King, G. C.; Tronc, M.; Read, F. H.
Journal of Physics B: Atomic and Molecular Physics, Vol. 10, Issue 16
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K -shell photoionization of O ^4 + and O ^5 + ions: experiment and theory
journal, November 2016

McLaughlin, B. M.; Bizau, J. -M.; Cubaynes, D.
Monthly Notices of the Royal Astronomical Society, Vol. 465, Issue 4
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High resolution, large spectral range, in variable-included-angle soft X-ray monochromators using a plane VLS grating
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Reininger, Ruben; de Castro, A. R. B.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 538, Issue 1-3
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Experimental Link of Photoionization of $S c^{2 +}$ to Photorecombination of $S c^{3 +}$ : An Application of Detailed Balance in a Unique Atomic System
journal, October 2002

Schippers, S.; Müller, A.; Ricz, S.
Physical Review Letters, Vol. 89, Issue 19
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K -shell photoionization of Be-like boron (B ⁺ ) ions: experiment and theory
journal, June 2014

Müller, A.; Schippers, S.; Phaneuf, R. A.
Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 47, Issue 13
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Spectroscopy of highly doubly-excited states of helium through dielectronic recombination
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DeWitt, D. R.; Lindroth, E.; Schuch, R.
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Relativistic configuration-interaction calculations of the energy levels of the $1 s^{2} 2 l$ and $1 s 2 l 2 l^{'}$ states in lithiumlike ions: Carbon through chlorine
journal, October 2017

Yerokhin, V. A.; Surzhykov, A.; Müller, A.
Physical Review A, Vol. 96, Issue 4
DOI: 10.1103/PhysRevA.96.042505

New high-resolution measurements of doubly excited states of Li ⁺
journal, August 1999

Diehl, S.; Cubaynes, D.; Bizau, J-M
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Lestinsky, M.; Lindroth, E.; Orlov, D. A.
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Effects of autoionization in electron loss from heliumlike highly charged ions in fast collisions with atomic particles
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Lyashchenko, K. N.; Andreev, O. Yu.; Voitkiv, A. B.
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Single particle counting of heavy ions with a channeltron detector
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Fricke, Joachim; Müller, Alfred; Salzborn, Erhard
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Observation of Triplet Doubly Excited States in Single Photon Excitation from Ground State Helium
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Penent, F.; Lablanquie, P.; Hall, R. I.
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Dielectronic recombination resonances in $F^{6 +}$
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Tokman, M.; Eklöw, N.; Glans, P.
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Alagia, M.; Coreno, M.; Farrokhpour, H.
Physical Review Letters, Vol. 102, Issue 15
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Indirect contributions to electron-impact ionization of ${Li}^{+}$ ( $1 s 2 s {}^{3}S_{1}$ ) ions: Role of intermediate double- $K$ -vacancy states
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Müller, A.; Borovik, A.; Huber, K.
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Calculation of doubly excited states of helium with a finite discrete spectrum
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Indelicato, Paul; Mohr, Peter J.
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High-precision measurement of the magnetic-dipole decay rate of metastable heliumlike carbon ions in a storage ring
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Computer Physics Communications, Vol. 223
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Correlated two-electron transitions in electron-impact ionization of ${Li}^{+}$ ions
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Müller, A.; Hofmann, G.; Weissbecker, B.
Physical Review Letters, Vol. 63, Issue 7
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Rydberg and autoionizing triplet states in Helium up to the N=5 threshold
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A multiconfiguration relativistic Dirac-Fock program
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Desclaux, J. P.
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Observation of Triplet Doubly Excited States in Single Photon Excitation from Ground State Helium
text, January 2001

Bucar, K.; Hall, R. I.; Lablanquie, P.
The American Physical Society
DOI: 10.17877/de290r-1914

Statistical Properties of Inter-Series Mixing in Helium: From Integrability to Chaos
text, January 2001

Delande, D.; Domke, M.; Grémaud, B.
The American Physical Society
DOI: 10.17877/de290r-7089

X-Ray Resonant Photoexcitation: Linewidths and Energies of Kα Transitions in Highly Charged Fe Ions
text, January 2013

Rudolph, Jan; Bernitt, S.; Epp, S. W.
Deutsches Elektronen-Synchrotron, DESY, Hamburg
DOI: 10.3204/desy-2013-00798

Codata Recommended Values Of The Fundamental Physical Constants: 2014
text, January 2015

Mohr, Peter J.; Newell, David B.; Taylor, Barry N.
Zenodo
DOI: 10.5281/zenodo.22826

He-like ions as practical astrophysical plasma diagnostics: From stellar coronae to active galactic nuclei
text, January 2011

Porquet, Delphine; Dubau, Jacques; Grosso, Nicolas
arXiv
DOI: 10.48550/arxiv.1101.3184

K-shell photoionization of ground-state Li-like boron ions [B$^{2+}$]: Experiment and Theory
text, January 2012

Müller, A.; Schippers, S.; Phaneu, R. A.
arXiv
DOI: 10.48550/arxiv.1203.5375

K-shell photoionization of ground-state Li-like carbon ions [C$^{3+}$]: experiment, theory and comparison with time-reversed photorecombination
text, January 2012

Müller, A.; Schippers, S.; Phaneuf, R. A.
arXiv
DOI: 10.48550/arxiv.1203.5441

Model operator approach to the Lamb shift calculations in relativistic many-electron atoms
text, January 2013

Shabaev, V. M.; Tupitsyn, I. I.; Yerokhin, V. A.
arXiv
DOI: 10.48550/arxiv.1305.6333

Works referencing / citing this record:

The photon‐ion merged‐beams experiment PIPE at PETRA III—The first five years
text, January 2020

Schippers, Stefan; Buhr, Ticia; Borovik, Alexander
GSI Helmholtzzentrum fuer Schwerionenforschung, GSI, Darmstadt
DOI: 10.15120/gsi-2021-00153

The photon‐ion merged‐beams experiment PIPE at PETRA III—The first five years
journal, April 2019

Schippers, Stefan; Buhr, Ticia; Borovik, Alexander
X-Ray Spectrometry, Vol. 49, Issue 1
DOI: 10.1002/xrs.3035

Photoionization and photofragmentation of singly charged positive and negative ${Sc}_{3} N @ C_{80}$ endohedral fullerene ions
journal, June 2019

Müller, A.; Martins, M.; Kilcoyne, A. L. D.
Physical Review A, Vol. 99, Issue 6
DOI: 10.1103/physreva.99.063401

Photoionization and photofragmentation of singly charged positive and negative Sc$_3$N@C$_{80}$ endohedral fullerene ions
text, January 2019

Mueller, Alfred; Martins, M.; Kilcoyne, A. L. D.
Deutsches Elektronen-Synchrotron, DESY, Hamburg
DOI: 10.3204/pubdb-2019-02410

The photon‐ion merged‐beams experiment PIPE at PETRA III—The first five years
text, January 2019

Schippers, Stefan; Buhr, Ticia; Borovik, Alexander
Deutsches Elektronen-Synchrotron, DESY, Hamburg
DOI: 10.3204/pubdb-2019-02368

Multiple Photodetachment of Carbon Anions via Single and Double Core-Hole Creation
text, January 2020

Perry-Sassmannshausen, Alexander; Buhr, Ticia; Borovik, Alexander
Deutsches Elektronen-Synchrotron, DESY, Hamburg
DOI: 10.3204/pubdb-2020-00903

Complex scaled relativistic configuration-interaction study of the $LL$ resonances in helium-like ions: from Boron to Argon
text, January 2019

Zaytsev, V. A.; Maltsev, I. A.; Tupitsyn, I. I.
arXiv
DOI: 10.48550/arxiv.1909.11487

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Title: Photoionization of metastable heliumlike C 4 + ( 1 s 2 s S 1 3 ) ions: Precision study of intermediate doubly excited states

Abstract

Citation Formats

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The Rayleigh-Schrodinger perturbation and the linked-diagram theorem for a multi-configurational model space journal, December 1974

K -shell photoionization of O + and O 2 + ions: Experiment and theory journal, August 2015

The Rydberg constant and proton size from atomic hydrogen journal, October 2017

Development of single‐particle detectors for keV ions journal, June 1982

A multiconfiguration relativistic DIRAC-FOCK program journal, January 1975

Low-energy collisions with atomic and molecular ions in a photocathode electron target journal, November 2009

Experiments with highly-charged ions in the storage ring TSR book, January 1991

The theory of two-electron atoms: between ground state and complete fragmentation journal, April 2000

Investigation of the energy and vibrational structure of the inner shell (1s)−1(π2p)1Π state of the nitrogen molecule by electron impact with high resolution journal, November 1977

Introduction to Plasma Spectroscopy book, January 2009

An investigation of the structure near the L 2,3 edges of argon, the M 4,5 edges of krypton and the N 4,5 edges of xenon, using electron impact with high resolution journal, August 1977

Analytical expression for the convolution of a Fano line profile with a gaussian text, January 2018

Theoretical energies for the n = 1 and 2 states of the helium isoelectronic sequence up to Z = 100 journal, July 1988

Prominent role of multielectron processes in K -shell double and triple photodetachment of oxygen anions journal, October 2016

K-shell photoionization of ground-state Li-like carbon ions [C 3+ ]: experiment, theory and comparison with time-reversed photorecombination journal, November 2009

The Variable Polarization XUV Beamline P04 at PETRA III: Optics, mechanics and their performance journal, May 2013

Shifts from a distant neighboring resonance journal, November 2010

Inner-Shell Excitations of 2 p Electrons of Argon Investigated by Fast Electron Impact with High Resolution journal, May 2011

Self-energy of excited states in a strong Coulomb field journal, March 1992

K-shell photoionization of ground-state Li-like boron ions [B 2 + ]: experiment and theory journal, June 2010

Extreme ultraviolet spectra excited by controlled electron impacts journal, April 1928

He-like Ions as Practical Astrophysical Plasma Diagnostics: From Stellar Coronae to Active Galactic Nuclei journal, December 2010

Correlation in double electron capture in collisions of fully stripped ions on He and H 2 journal, April 1989

Two-photon decay of 2 1 S 0 and 2 3 S 1 states of heliumlike ions journal, August 1997

Photoionization of Sc 2 + ions by synchrotron radiation: Measurements and absolute cross sections in the photon energy range 23–68 eV journal, March 2003

Electron–ion collisions: Fundamental processes in the focus of applied research book, January 2008

X-Ray Resonant Photoexcitation: Linewidths and Energies of K α Transitions in Highly Charged Fe Ions journal, September 2013

Some Observable Effects of the Quantum-Mechanical Fluctuations of the Electromagnetic Field journal, November 1948

K-shell photoionization of Be-like carbon ions: experiment and theory for C 2+ journal, June 2005

Erratum: Relativistic configuration-interaction calculations of the energy levels of the 1 s 2 2 l and 1 s 2 l 2 l ′ states in lithiumlike ions: Carbon through chlorine [Phys. Rev. A 96 , 042505 (2017)] journal, December 2017

Model operator approach to the Lamb shift calculations in relativistic many-electron atoms journal, July 2013

Double − K − vacancy states in electron-impact single ionization of metastable two-electron N 5 + ( 1 s 2 s 3 S 1 ) ions journal, July 2014

Near- K -Edge Double and Triple Detachment of the F − Negative Ion: Observation of Direct Two-Electron Ejection by a Single Photon journal, March 2018

Two-loop QED corrections with closed fermion loops journal, June 2008

Inclusion of radiation damping in the close-coupling equations for electron-atom scattering journal, August 1995

Dielectronic satellite spectra for highly charged H-like ions (2l′3l″−1s2l, 2l′3l″−1s3l) and He-like ions (1s2l′3l″−1s22l, 1s2l′3l″−1s23l) with Z = 6–33 journal, July 1980

New Autoionizing Atomic Energy Levels in He, Ne, and Ar journal, June 1963

Atomic Resonance States and Their Role in Charge-Changing Processes book, January 2012

Analytical expression for the convolution of a Fano line profile with a gaussian journal, November 2018

Threshold truncation of a giant dipole resonance in photoionization of Ti 3+ journal, May 2004

Absolute Photoionization Cross Section with an Ultra-high Energy Resolution for Ne in the Region of 1s Rydberg States conference, January 2007

Multiconfiguration Dirac-Fock calculations of transition energies with QED corrections in three-electron ions journal, November 1990

Doubly excited resonances in the photoionization spectrum of Li + : experiment and theory journal, September 2006

Absolute measurement of radiative and Auger rates of K − shell − vacancy states in highly charged Fe ions journal, March 2015

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Energy levels and transition rates for helium-like ions with Z = 10–36 journal, August 2016

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QEDMOD: Fortran program for calculating the model Lamb-shift operator journal, April 2015

Experiments with highly-charged ions in the storage ring TSR journal, March 1991

Near- K -edge single, double, and triple photoionization of C + ions journal, January 2018

Self-energy correction to one-electron energy levels in a strong Coulomb field journal, October 1992

Photoionization and double excitation spectrum of Be2+ journal, June 1984

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An Introduction to the Atomic and Radiation Physics of Plasmas book, February 2018

QED self-energy contribution to highly excited atomic states journal, October 2001

Lifetime of a K-shell vacancy in atomic carbon created by 1s 2p photoexcitation of C + journal, February 2004

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Observation of a Four-Electron Auger Process in Near- K -Edge Photoionization of Singly Charged Carbon Ions journal, January 2015

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Absolute cross sections for photoionization of Xe q + ions ( 1 ⩽ q ⩽ 5 ) at the 3d ionization threshold journal, May 2014

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Dielectronic recombination of hydrogenlike oxygen in a heavy-ion storage ring journal, February 1990

Multiconfigurational Dirac-Fock studies of two-electron ions. II. Radiative corrections and comparison with experiment journal, February 1987

CODATA Recommended Values of the Fundamental Physical Constants: 2014 journal, December 2016

Photoionization of C 2+ ions: time-reversed recombination of C 3+ with electrons journal, March 2002

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New light on electron—ion collisions from heavy–ion storage ring experiments journal, May 1999

An investigation of the structure near the L2,3 edges of argon, the M4,5 edges of krypton and the N4,5 edges of xenon, using electron impact with high resolution journal, November 1977

Title: Photoionization of metastable heliumlike $C^{4 +} (1 s 2 s {}^{3}S_{1})$ ions: Precision study of intermediate doubly excited states

Photoionization of Ne Atoms and Ne ⁺ Ions Near the K Edge: PrecisionSpectroscopy and Absolute Cross-sections
journal, February 2017

The Rayleigh-Schrodinger perturbation and the linked-diagram theorem for a multi-configurational model space
journal, December 1974

K -shell photoionization of $O^{+}$ and $O^{2 +}$ ions: Experiment and theory
journal, August 2015

The Rydberg constant and proton size from atomic hydrogen
journal, October 2017

Development of single‐particle detectors for keV ions
journal, June 1982

A multiconfiguration relativistic DIRAC-FOCK program
journal, January 1975

Low-energy collisions with atomic and molecular ions in a photocathode electron target
journal, November 2009

Experiments with highly-charged ions in the storage ring TSR
book, January 1991

The theory of two-electron atoms: between ground state and complete fragmentation
journal, April 2000

Investigation of the energy and vibrational structure of the inner shell (1s)−1(π2p)1Π state of the nitrogen molecule by electron impact with high resolution
journal, November 1977

Introduction to Plasma Spectroscopy
book, January 2009

An investigation of the structure near the L _2,3 edges of argon, the M _4,5 edges of krypton and the N _4,5 edges of xenon, using electron impact with high resolution
journal, August 1977

Analytical expression for the convolution of a Fano line profile with a gaussian
text, January 2018

Theoretical energies for the n = 1 and 2 states of the helium isoelectronic sequence up to Z = 100
journal, July 1988

Prominent role of multielectron processes in $K$ -shell double and triple photodetachment of oxygen anions
journal, October 2016

K-shell photoionization of ground-state Li-like carbon ions [C ³⁺ ]: experiment, theory and comparison with time-reversed photorecombination
journal, November 2009

The Variable Polarization XUV Beamline P04 at PETRA III: Optics, mechanics and their performance
journal, May 2013

Shifts from a distant neighboring resonance
journal, November 2010

Inner-Shell Excitations of 2 p Electrons of Argon Investigated by Fast Electron Impact with High Resolution
journal, May 2011

Self-energy of excited states in a strong Coulomb field
journal, March 1992

K-shell photoionization of ground-state Li-like boron ions [B ^{2 +} ]: experiment and theory
journal, June 2010

Extreme ultraviolet spectra excited by controlled electron impacts
journal, April 1928

He-like Ions as Practical Astrophysical Plasma Diagnostics: From Stellar Coronae to Active Galactic Nuclei
journal, December 2010

Correlation in double electron capture in collisions of fully stripped ions on He and $H_{2}$
journal, April 1989

Two-photon decay of $2^{1} S_{0}$ and $2^{3} S_{1}$ states of heliumlike ions
journal, August 1997

Photoionization of Sc 2 + ions by synchrotron radiation: Measurements and absolute cross sections in the photon energy range 23–68 eV
journal, March 2003

Electron–ion collisions: Fundamental processes in the focus of applied research
book, January 2008

X-Ray Resonant Photoexcitation: Linewidths and Energies of $K α$ Transitions in Highly Charged Fe Ions
journal, September 2013

Some Observable Effects of the Quantum-Mechanical Fluctuations of the Electromagnetic Field
journal, November 1948

K-shell photoionization of Be-like carbon ions: experiment and theory for C ²⁺
journal, June 2005

Erratum: Relativistic configuration-interaction calculations of the energy levels of the $1 s^{2} 2 l$ and $1 s 2 l 2 l^{'}$ states in lithiumlike ions: Carbon through chlorine [Phys. Rev. A 96 , 042505 (2017)]
journal, December 2017

Model operator approach to the Lamb shift calculations in relativistic many-electron atoms
journal, July 2013

$Double - K - vacancy$ states in electron-impact single ionization of metastable two-electron $N^{5 +} (1 s 2 s$ $^{3} S_{1}$ ) ions
journal, July 2014

Near- $K$ -Edge Double and Triple Detachment of the $F^{-}$ Negative Ion: Observation of Direct Two-Electron Ejection by a Single Photon
journal, March 2018

Two-loop QED corrections with closed fermion loops
journal, June 2008

Inclusion of radiation damping in the close-coupling equations for electron-atom scattering
journal, August 1995

Dielectronic satellite spectra for highly charged H-like ions (2l′3l″−1s2l, 2l′3l″−1s3l) and He-like ions (1s2l′3l″−1s22l, 1s2l′3l″−1s23l) with Z = 6–33
journal, July 1980

New Autoionizing Atomic Energy Levels in He, Ne, and Ar
journal, June 1963

Atomic Resonance States and Their Role in Charge-Changing Processes
book, January 2012

Analytical expression for the convolution of a Fano line profile with a gaussian
journal, November 2018

Threshold truncation of a giant dipole resonance in photoionization of Ti 3+
journal, May 2004

Absolute Photoionization Cross Section with an Ultra-high Energy Resolution for Ne in the Region of 1s Rydberg States
conference, January 2007

Multiconfiguration Dirac-Fock calculations of transition energies with QED corrections in three-electron ions
journal, November 1990

Doubly excited resonances in the photoionization spectrum of Li ⁺ : experiment and theory
journal, September 2006

Absolute measurement of radiative and Auger rates of $K - shell - vacancy$ states in highly charged Fe ions
journal, March 2015

K-shell excitation spectra of CO, N2 and O2
journal, January 1980

Energy levels and transition rates for helium-like ions with Z = 10–36
journal, August 2016

Dielectronic recombination data for dynamic finite-density plasmas: X. The hydrogen isoelectronic sequence
journal, January 2006

High-resolution study of ${}^{1}$ $P^{o}$ double-excitation states in helium
journal, March 1996

Doubly Excited Autoionization Resonances in the Absorption Spectrum of ${Li}^{+}$ Formed in a Laser-Produced Plasma
journal, May 1977

Atomic data for doubly-excited states 2lnl′ of He-like ions and 1s2lnl′ of Li-like ions with Z=6–36 and n=2,3
journal, January 2017

Extensive double-excitation states in atomic helium
journal, March 1991

The lamb shift in hydrogen-like atoms, 1 ⩽ Z ⩽ 110
journal, November 1985

QEDMOD: Fortran program for calculating the model Lamb-shift operator
journal, April 2015

Experiments with highly-charged ions in the storage ring TSR
journal, March 1991

Near- $K$ -edge single, double, and triple photoionization of $C^{+}$ ions
journal, January 2018

Self-energy correction to one-electron energy levels in a strong Coulomb field
journal, October 1992

Photoionization and double excitation spectrum of Be2+
journal, June 1984

Relativistic all-order pair functions from a discretized single-particle Dirac Hamiltonian
journal, November 1989

Precision studies of deep-inner-shell photoabsorption by atomic ions
journal, April 2015

Interpretation of Solar Helium-Like Ion Line Intensities
journal, July 1969

An Introduction to the Atomic and Radiation Physics of Plasmas
book, February 2018

QED self-energy contribution to highly excited atomic states
journal, October 2001

Lifetime of a K-shell vacancy in atomic carbon created by 1s 2p photoexcitation of C ⁺
journal, February 2004

Observation of the (2 p , nd $)^{1}$ $P^{o}$ double-excitation Rydberg series of helium
journal, August 1992

Statistical Properties of Inter-Series Mixing in Helium: From Integrability to Chaos
journal, April 2001

Observation of a Four-Electron Auger Process in Near- $K$ -Edge Photoionization of Singly Charged Carbon Ions
journal, January 2015

A new plasma potential measurement instrument for plasma ion sources
journal, September 2004

Absolute cross sections for photoionization of Xe ^{q +} ions ( 1 ⩽ q ⩽ 5 ) at the 3d ionization threshold
journal, May 2014

Observation of $2 p 3 d (^{1} P^{o}) \to 1 s 3 d (^{1} D^{e})$ Radiative Transition in He-like Si, S, and Cl Ions
journal, December 2013

Dielectronic recombination of hydrogenlike oxygen in a heavy-ion storage ring
journal, February 1990

Multiconfigurational Dirac-Fock studies of two-electron ions. II. Radiative corrections and comparison with experiment
journal, February 1987

CODATA Recommended Values of the Fundamental Physical Constants: 2014
journal, December 2016

Photoionization of C ²⁺ ions: time-reversed recombination of C ³⁺ with electrons
journal, March 2002

A Review of Radiative and Dielectronic Recombination for C and O Ions
journal, January 1989

New light on electron—ion collisions from heavy–ion storage ring experiments
journal, May 1999

An investigation of the structure near the L2,3 edges of argon, the M4,5 edges of krypton and the N4,5 edges of xenon, using electron impact with high resolution
journal, November 1977

K -shell photoionization of O ^4 + and O ^5 + ions: experiment and theory
journal, November 2016

High resolution, large spectral range, in variable-included-angle soft X-ray monochromators using a plane VLS grating
journal, February 2005