Auger decay processes of resonantly excited 3d −14f configuration of xenon-like ions in solids

Abstract

The synchrotron-radiation-induced Auger and photoelectron spectra of xenon-like ions I − and Cs + (in CsI), Ba 2+ (in BaF 2), and La 3+ (in LaF 3) have been measured in the vicinity of the M 45 absorption edges of these ions. It is shown that the spectra of La and Ba excited at 3d 10 → 3d 94f resonances exhibit a very intense 4f-spectator structure which changes its energy and intensity with energy of excited photons. Calculation of the Auger decay of the 3d −14f configuration shows that this structure is due to transitions to the 4d −24f + 4p −1 final ionic configuration which high-energy part is overlapped with the 4d −2 continuum. In the case of Ba this structure coexist with the normal Auger structure which appear as a result of the M 4M 5N 67 Coster-Kronig transitions. The spectra of I − contain only the normal M 45N 45N 45 Auger components. The spectra of Cs + are similar to those of I − with a small admixture of the 4f-spectator-like structure. the anomalous behaviour of the intensity ratio of 4d 3 2 and 4d 5 2 photolines of La and Ba at the resonance excitation energies is found and attributed to the strong term-dependence of the participator Auger process.