Energy variation of double K-shell photoionization of Ne

Southworth, Stephen H.; Li, Shuai; Koulentianos, Dimitris; Doumy, Gilles; Young, Linda; Walko, D. A.; Puettner, Ralph; Ceolin, Denis; Guillemin, Renaud; Ismail, Iyas; Travnikova, Oksana; Piancastelli, Maria Novella; Simon, Marc; Manson, Steven T.; Gorczyca, Thomas W.

doi:10.1103/PhysRevA.107.023110

Energy variation of double K-shell photoionization of Ne

Journal Article · Tue Feb 21 00:00:00 EST 2023 · Physical Review A - Atomic, Molecular, and Optical Physics

DOI:https://doi.org/10.1103/PhysRevA.107.023110· OSTI ID:1957738

Southworth, Stephen H. ^[1]; Li, Shuai ^[1]; Koulentianos, Dimitris ^[2]; Doumy, Gilles ^[1]; Young, Linda ^[3]; Walko, D. A. ^[4]; Puettner, Ralph ^[5]; Ceolin, Denis ^[6]; Guillemin, Renaud ^[7]; Ismail, Iyas ^[7]; Travnikova, Oksana ^[7]; Piancastelli, Maria Novella ^[8]; Simon, Marc ^[7]; Manson, Steven T. ^[9]; Gorczyca, Thomas W. ^[10]

Argonne National Lab. (ANL), Lemont, IL (United States)
Argonne National Lab. (ANL), Lemont, IL (United States); Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany). Center for Free-Electron Laser Science; Univ. of Hamburg (Germany)
Argonne National Lab. (ANL), Lemont, IL (United States); Univ. of Chicago, IL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Freie Univ., Berlin (Germany)
Synchrotron SOLEIL, Gif-sur-Yvette (France)
Synchrotron SOLEIL, Gif-sur-Yvette (France); Sorbonne Univ., Paris (France); Centre National de la Recherche Scientifique (CNRS) (France)
Sorbonne Univ., Paris (France); Centre National de la Recherche Scientifique (CNRS) (France)
Georgia State Univ., Atlanta, GA (United States)
Western Michigan Univ., Kalamazoo MI (United States)

Herein we report on an experimental and theoretical study of double K-shell photoionization of Ne over the 2.3–8.5 keV x-ray energy range. The ratio of double-to-single K-shell photoionization cross sections was determined experimentally by measuring the relative rates of the KK–KL_2,3L_2,3 (²D) Auger hypersatellite and the K–L_2,3L_2,3 (¹D) diagram Auger transitions. By scaling the hypersatellite-diagram Auger-electron ratios to KK/K cross-section ratios, comparison was made with theoretical cross-section ratios of He-like Ne⁸⁺ determined by the R matrix with pseudostates method. The experimental Ne and theoretical Ne⁸⁺ cross-section ratios show similar variations with energy, but the experimental ratios systematically exceed the calculated ratios and also show a lower threshold energy for double K-shell photoionization onset compared to the computed Ne⁸⁺ threshold. The discrepancy is attributed to effects of L-shell electrons not included in the He-like Ne⁸⁺ calculations. Quantified scaling with nuclear charge Z along the He-like isoelectronic sequence indicates that the measured 10-electron Z = 10 double K-shell photoionization cross section behaves like the computed He-like Z = 8.9 cross section, suggesting an effective nuclear screening parameter of s_L=1.1 by the additional eight outer L-shell electrons. Experimental results for the energy variations of Auger electron transitions from other multielectron hole states are also discussed.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Aeronautics and Space Administration (NASA); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1957738

Alternate ID(s):: OSTI ID: 1962270

Journal Information:: Physical Review A - Atomic, Molecular, and Optical Physics, Journal Name: Physical Review A - Atomic, Molecular, and Optical Physics Journal Issue: 2 Vol. 107; ISSN 1050-2947

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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