What question did this study set out to answer?

This research aims to explore the effects of core relaxation on atomic photoionization in xenon.

March 26, 2026Open Access

Dramatic effects of relaxation on many-body interactions: Theoretical and experimental study of atomic photoionization of outer shells in the vicinity of inner-shell thresholds

RSR. V. Silva CMC. Rasadi Munasinghe AGAarthi GanesanUniversity College for Women

Key Points

This research aims to explore the effects of core relaxation on atomic photoionization in xenon.
Conducted experiments on Xe 4d5/2:4d3/2 branching ratios near 3d thresholds.
Performed new calculations using the Relativistic-Random-Phase Approximation (RRPA) with core relaxation included.
Compared theoretical predictions with experimental results for accuracy.
Experimental data show significant structure due to interchannel coupling.
Inclusion of core relaxation in RRPA calculations leads to agreement with experimental findings.
Previous RRPA calculations without relaxation revealed both quantitative and qualitative discrepancies.

Abstract

Experimental studies of the Xe 4d5/2:4d3/2 branching ratio in the vicinity of the inner shell 3d thresholds have been made and exhibit significant structure owing to interchannel coupling. New calculations at the Relativistic-Random-Phase Approximation (RRPA) also are reported here in which core relaxation has been included (RRPA-R) and this brings theory and experiment into excellent agreement. Earlier RRPA calculations that ignore relaxation are in both quantitative and qualitative disagreement with the present experimental results.

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