Two-photon above-threshold ionization of helium

Wang, Yimeng; Greene, Chris H.

doi:10.1103/PhysRevA.103.033103

Title: Two-photon above-threshold ionization of helium

Abstract

Multiphoton ionization provides a clear window into the nature of electron correlations in the helium atom. In the present study, the final-state energy range extends up to the region near the N = 2 and N = 3 ionization thresholds, where two-photon ionization proceeds via continuum intermediate states above the lowest threshold. Our calculations are performed using multichannel quantum defect theory (MQDT) and the streamlined R-matrix method. The sum and integration over all intermediate states in the two-photon ionization amplitude is evaluated using the inhomogeneous R-matrix method developed by Robicheaux and Gao. The seamless connection of that method with MQDT allows us to present high-resolution spectra of the final-state Rydberg resonances. Our analysis classifies the resonances above the N = 2 threshold in terms of their group theory quantum numbers. Furthermore, their dominant decay channels are found to obey the previously conjectured propensity rule far more weakly for these even-parity states than was observed for the odd-parity states relevant to single-photon ionization.

Authors:

^[1];

^[1]

Purdue Univ., West Lafayette, IN (United States)

Publication Date:: Thu Mar 04 00:00:00 EST 2021

Research Org.:: Purdue Univ., West Lafayette, IN (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1768818

Grant/Contract Number:: SC0010545

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review A

Additional Journal Information:: Journal Volume: 103; 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; Multiphoton ionization; Rydberg states; R-matrix theory; Multichannel quantum defect theory; Multiphoton or tunneling ionization & excitation; Single- and few-photon ionization & excitation

Citation Formats


                    Wang, Yimeng, and Greene, Chris H. Two-photon above-threshold ionization of helium.  United States: N. p., 2021. 
Web.  doi:10.1103/PhysRevA.103.033103.

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                    Wang, Yimeng, & Greene, Chris H. Two-photon above-threshold ionization of helium.  United States.  https://doi.org/10.1103/PhysRevA.103.033103

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                    Wang, Yimeng, and Greene, Chris H. Thu .  
"Two-photon above-threshold ionization of helium".  United States.  https://doi.org/10.1103/PhysRevA.103.033103.  https://www.osti.gov/servlets/purl/1768818.

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@article{osti_1768818,

  title        = {Two-photon above-threshold ionization of helium},

  author       = {Wang, Yimeng and Greene, Chris H.},

  abstractNote = {Multiphoton ionization provides a clear window into the nature of electron correlations in the helium atom. In the present study, the final-state energy range extends up to the region near the N = 2 and N = 3 ionization thresholds, where two-photon ionization proceeds via continuum intermediate states above the lowest threshold. Our calculations are performed using multichannel quantum defect theory (MQDT) and the streamlined R-matrix method. The sum and integration over all intermediate states in the two-photon ionization amplitude is evaluated using the inhomogeneous R-matrix method developed by Robicheaux and Gao. The seamless connection of that method with MQDT allows us to present high-resolution spectra of the final-state Rydberg resonances. Our analysis classifies the resonances above the N = 2 threshold in terms of their group theory quantum numbers. Furthermore, their dominant decay channels are found to obey the previously conjectured propensity rule far more weakly for these even-parity states than was observed for the odd-parity states relevant to single-photon ionization.},

  doi          = {10.1103/PhysRevA.103.033103},

  journal      = {Physical Review A},

  number       = 3,

  volume       = 103,

  place        = {United States},

  year         = {Thu Mar 04 00:00:00 EST 2021},

  month        = {Thu Mar 04 00:00:00 EST 2021}

}

Copy to clipboard

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Similar Records

Title: Two-photon above-threshold ionization of helium

Abstract

Citation Formats

Time-domain perspective on Autler-Townes splitting in attosecond transient absorption of laser-dressed helium atoms journal, October 2013

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

Multichannel quantum-defect approach for two-photon processes journal, April 1993

Extensive eigenchannel R -matrix study of the H − photodetachment spectrum journal, February 1992

Complex-coordinate calculations for doubly excited states of two-electron atoms journal, May 1981

Double photoionization of helium using R -matrix methods journal, November 1994

General form of the quantum-defect theory. II journal, November 1982

Algebra of the Noncompact Group O ( 3 , 2 ) and the Hydrogen-Atom Radial Functions journal, June 1972

Angular distributions of ejected electrons from autoionizing 3 pnd states of magnesium journal, October 1992

General form of the quantum-defect theory journal, April 1979

Doubly excited states of helium atoms between the N=2 and N=3 He + thresholds journal, September 1985

Two-photon double ionization of He journal, December 2002

Nonadiabatic selection rules for the photoabsorption of H − and He journal, June 1991

Energy levels and classifications of doubly-excited states in two-electron systems with nuclear charge, Z = 1, 2, 3, 4, 5, below the N = 2 and N = 3 thresholds journal, August 1977

Taking control of polarization journal, June 2014

Controlling Atomic Line Shapes journal, May 2013

The Influence of Close Coupling on the Threshold Behaviour of Cross Sections of Electron-Hydrogen Scattering journal, August 1963

Two-photon processes in real atoms journal, November 1991

Group theoretical treatments of strongly correlated atomic dynamics journal, February 1990

Dominant photodetachment channels in H − journal, July 1990

Classification and supermultiplet structure of doubly excited states journal, March 1984

Properties of autoionizing states of He journal, September 1968

Correlations of two excited electrons journal, February 1983

Quantum defect theory journal, February 1983

Erratum: General form of the quantum-defect theory. II journal, December 1984

Theory of two-photon spectroscopy of autoionizing states in helium and beryllium journal, June 1995

Anisotropy of excited He + formed in the photoionization of helium journal, January 1989

Lorentz Meets Fano in Spectral Line Shapes: A Universal Phase and Its Laser Control journal, May 2013

Two-Electron Photoejection of He and H − journal, June 1997

Multichannel theory of two-photon single and double ionization of helium journal, February 2001

Two-photon double ionization of He and journal, October 1998

Time-domain perspective on Autler-Townes splitting in attosecond transient absorption of laser-dressed helium atoms
journal, October 2013

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

Multichannel quantum-defect approach for two-photon processes
journal, April 1993

Extensive eigenchannel R -matrix study of the $H^{-}$ photodetachment spectrum
journal, February 1992

Complex-coordinate calculations for doubly excited states of two-electron atoms
journal, May 1981

Double photoionization of helium using R -matrix methods
journal, November 1994

General form of the quantum-defect theory. II
journal, November 1982

Algebra of the Noncompact Group $O (3, 2)$ and the Hydrogen-Atom Radial Functions
journal, June 1972

Angular distributions of ejected electrons from autoionizing 3 pnd states of magnesium
journal, October 1992

General form of the quantum-defect theory
journal, April 1979

Doubly excited states of helium atoms between the N=2 and N=3 He ⁺ thresholds
journal, September 1985

Two-photon double ionization of He
journal, December 2002

Nonadiabatic selection rules for the photoabsorption of $H^{-}$ and He
journal, June 1991

Energy levels and classifications of doubly-excited states in two-electron systems with nuclear charge, Z = 1, 2, 3, 4, 5, below the N = 2 and N = 3 thresholds
journal, August 1977

Taking control of polarization
journal, June 2014

Controlling Atomic Line Shapes
journal, May 2013

The Influence of Close Coupling on the Threshold Behaviour of Cross Sections of Electron-Hydrogen Scattering
journal, August 1963

Two-photon processes in real atoms
journal, November 1991

Group theoretical treatments of strongly correlated atomic dynamics
journal, February 1990

Dominant photodetachment channels in $H^{-}$
journal, July 1990

Classification and supermultiplet structure of doubly excited states
journal, March 1984

Properties of autoionizing states of He
journal, September 1968

Correlations of two excited electrons
journal, February 1983

Quantum defect theory
journal, February 1983

Erratum: General form of the quantum-defect theory. II
journal, December 1984

Theory of two-photon spectroscopy of autoionizing states in helium and beryllium
journal, June 1995

Anisotropy of excited ${He}^{+}$ formed in the photoionization of helium
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