Photon-Induced L3 Subshell x-ray Intensity Ratios for Re, Au, Tl and Pb

Abstract

The relative intensities of L3 subshell x-rays were measured for the elements Re, Au, Tl and Pb by photoionization of L3 subshell electrons. The L3 subshell electrons are excited by the K x-rays of the elements used as the primary targets and fluorescent L3 subshell x-ray intensities are measured with a Si(Li) detector. The primary targets were chosen such that their K x-rays excited the L3 subshell of the element concerned but did not excite the L2 and L1 subshells. Ge, Se, Br and Rb K x-rays were used to excite the L3 subshells of Re, Au, Tl and Pb, respectively. The Ge, Se, Br and Rb K x-rays, for this purpose, were obtained by irradiating the targets of these elements by 59.54 keV gamma rays from an Am-241 source. The theoretical L3 subshell intensity ratios were calculated using radiative transition rates based on the Dirac–Fock (DF) model and the Dirac–Hartree–Slater (DHS) model. The calculated results were compared with the experimentally measured relative intensities to check the applicability of emission rates based on the DF and DHS models.