Theoretical simulation of K[formula omitted]V inner-shell processes in Ne and Ar

Abstract

Photoelectron spectra associated to the formation of K−2V double core hole states following single photon absorption have been simulated in gas phase for Neon and Argon. The spectra are dominated by 1s−2ns1 direct lines and 1s−2np1 conjugate lines (n=3 for Ne; n=4 for Ar) which have similar intensities. Very weak theoretical cross-sections are found in Argon at the K−2V-Ar edge, fifty times lower than those for Neon at the K−2V-Ne edge. The comparative use of a magnetic bottle coincidence technique on one side and a hard X-ray spectrometer synchrotron device at high photon flux on the other side is suggested, in order to record reasonable signals and to disentangle K−2V conjugate and direct quantum paths. The origin in K−2V of balanced direct/conjugate contributions and weak cross-sections is discussed in comparison with K−1 single core hole (X-ray ionization, X-ray absorption) photoelectron spectra characteristics.