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Article Dans Une Revue Physical Review A Année : 2023

Energy variation of double K-shell photoionization of Ne

S H Southworth
S. Li
D. Koulentianos
G. Doumy
L. Young
D A Walko
  • Fonction : Auteur
R. Püttner
D. Céolin
M N Piancastelli
  • Fonction : Auteur
S T Manson
T W Gorczyca

Résumé

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 2,3 L 2,3 (2 D) Auger hypersatellite and the K − L 2,3 L 2,3 (1 D) 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 Ne 8+ determined by the R matrix with pseudostates method. The experimental Ne and theoretical Ne 8+ 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 Ne 8+ threshold. The discrepancy is attributed to effects of L-shell electrons not included in the He-like Ne 8+ 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.
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Dates et versions

hal-04284852 , version 1 (14-11-2023)

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S H Southworth, S. Li, D. Koulentianos, G. Doumy, L. Young, et al.. Energy variation of double K-shell photoionization of Ne. Physical Review A, 2023, 107 (2), pp.023110. ⟨10.1103/physreva.107.023110⟩. ⟨hal-04284852⟩
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