Study of vacancy decays in the L-shell photoionization of barium in the excitation energy range of 5.6–30 keV: from L₂edge to energy high above the thresholds of double L-vacancy production

Abstract

Photoinduced Ba L x-rays were measured, in the excitation energy range of 5.6–30 keV, by using high-brilliance undulator radiation. The obtained intensity ratios, the excitation-energy independent Lβ4/Lβ3, Lη/Lβ1, Lι/Lα1,2, Lβ6/Lα1,2 and Lβ2,15/Lα1,2 as well as the excitation-energy dependent Lβ1/Lα1,2, Lβ3/Lα1,2 and Lβ3/Lβ1, were compared with theoretical calculations, in which the calculations were performed by applying various subsets of the L subshell fluorescence yields and Coster–Kronig yields. Deviations of the theoretical calculations from the experimental results call on improvements in theory for the emission rates. We have also surveyed the Lα1,2 related x-ray hypersatellite lines in the photoinduced Ba L x-ray spectrum.