2022/09/23 by Satoshi Kosugi, R. Guillemin, Oksana Travnikova +15 · 1 voice
Materials Science · Physics and Astronomy · #Advanced Chemical Physics Studies #Electron and X-Ray Spectroscopy Techniques #X-ray Spectroscopy and Fluorescence Analysis
paper · pdf · doi:10.1103/physreva.106.033114
openalex publication_date 2022/09/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
Postcollision-interaction (PCI) effects involving multistep decay processes following Ar 1s photoionization has been studied by Auger electron spectroscopy. The experiment focused on LMM Auger electrons measured in small photon energy steps across the Ar 1s photoionization threshold. Decay pathways that we studied include (1) the Ar+*2p--1\ensuremath→Ar2+3p--2 LMM\ensuremathα Auger process due to a single L hole created by KL fluorescence, (2) the Ar2+*2p--2\ensuremath→Ar3+*2p--13p--2 LMM1 Auger process following double L shell hole states produced by a KLL Auger processes, and (3) the subsequent Ar3+*2p--13p--2\ensuremath→Ar4+3p--4 LMM2 Auger transitions. Particularly pronounced PCI shifts and unusual line shapes compared to the ordinary one-step PCI process were found in the spectra of Auger processes following a KLL Auger first step. The experimental results were compared with calculations based on the semiclassical approach to PCI. Good agreement was found between the calculated and experimental PCI shifts. The result opens possibilities for further studies of the multielectron dynamics between Auger electrons mediated through the photoelectron in these and similar systems.