Study of vacancy decays in the L-shell photoionization of barium in the excitation energy range of 5.6-30 keV: from L-2 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 L beta(4)/L beta(3), L eta/L beta(1), L iota/L alpha(1,2), L beta(6)/ L alpha(1,2) and L beta(2,15)/L alpha(1,2) as well as the excitation- energy dependent L beta(1)/L alpha(1,2), L beta(3)/L alpha(1,2) and L beta(3)/L beta(1), 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 L alpha(1,2) related x-ray hypersatellite lines in the photoinduced Ba L x-ray spectrum