Abstract
We report on an experimental and theoretical study of postcollision interaction (PCI) effects on ${L}_{2}\ensuremath{-}{M}_{4,5}{N}_{2,3}$ Auger electrons measured above the Kr $K$-edge in which ${L}_{2}$ vacancies are primarily generated by $K{L}_{2}$ x-ray emission. Such cascade processes, in which a deep inner-shell vacancy decays first by x-ray emission followed by Auger electron emission, is a strong decay mode in heavy atoms. The ${L}_{2}\ensuremath{-}{M}_{4,5}{N}_{2,3}$ Auger electron peak is observed to become increasingly asymmetric with a shifting peak maximum as the absorbed x-ray energy approaches the $K$-shell ionization threshold. This is attributed to PCI energy exchanges of the Auger electron with the $1s$ photoelectron. To model the PCI effects, we have applied a semiclassical approach modified to account for the combined lifetimes of the $K$ and ${L}_{2}$ hole states. In addition, our analysis treats several closely spaced Auger transitions with final ionic states having different terms and angular momenta.
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