M(4,5)N(4,5)N(4,5) AUGER DECAY SPECTRA OF THE RESONANTLY EXCITED 3D(9)4F CONFIGURATION OF XENONLIKE IONS IN SOLIDS

The synchrotron-radiation-induced Auger and photoelectron spectra of t he xenonlike ions I- (in CsI), Cs+ (in CsI), Ba2+ (in BaF2), and La3(in LaF3) have been measured in the vicinity of the M4,5 absorption ed ges of these ions. It is shown that the spectra of La and Ba measured at 3d10-->3d94f resonances exhibit a very intense 4f-spectator structu re which changes its energy and intensity with the energy of the excit ing photons. Calculation of the Auger decay of the 3d(-1)4f configurat ion shows that this structure is due to transitions to the 4d(-2)4f 4p-1 final ionic configuration, the high-energy part of which overlaps the 4d-2 continuum. In the case of Ba this structure coexists with th e normal Auger structure which appears as a result of the M4M5N6,7 Cos ter-Kronig transitions. The spectra of I- contain only the normal M4,5 N4,5N4,5 Auger structure related to the 3d-1 --> 4d-2 transitions. The spectra of Cs+ are similar to those of I- with a small admixture of t he 4f-spectator-like structure.