Study of vacancy decays in the L-shell photoionization of barium in the excitation energy range of 5.6-30 keV: from L2 edge to energy high above the thresholds of double L-vacancy production

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