Photoemission study of Kr 3d→npautoionization resonances

Abstract

Resonant photoelectron spectra of Kr have been taken in the photon-energy ranges of the 3$d_{5/2}$→5p,6p and 3$d_{3/2}$→5p excitations. The spectra, which closely resemble normal ${\mathrm{Kr}}^{+}$ 3$d^{\mathrm{-}1}$ Auger spectra, illustrate the importance of ‘‘spectator’’ Auger-like decay for inner-shell resonances, in which the initially excited electron does not participate in the core-hole deexcitation process, except to respond to the change in the atomic potential. Possible assignments for some of the spectator decay channels are discussed based on photoemission intensity measurements at the different 3d resonances. These assignments suggest that shake-up (e.g., 5p→6p) of the ‘‘spectator’’ electron during the decay process is not quite as important as previously suspected. The resonance profiles of some of the more intense satellites have been determined over the 3d→np resonances. Very small resonance effects also were observed in the partial cross section for 4p subshell ionization, which produced asymmetric Fano-type profiles. The 4p angular distribution, in contrast, exhibits a pronounced effect in the resonance energy range. The 4p results demonstrate that nonspectator autoionization also is present.