Measurements of L to M shell vacancy transfer probabilities for the elements in the atomic region 70 ≤ Z ≤ 92

Abstract

The probabilities for vacancy transfer from L to M shell, \\ ̄ gh LM, are deduced for 15 elements in the atomic region 70 ≤ Z ≤ 92 by measuring the M X-ray yields from the targets excited by 5.96 and 22.6 keV incident photons, i.e. below and above the L-edge of the elements and using the theoretical L and M shell photoionisation cross-sections. These results are compared with the theoretical values based on the relativistic Dirac-Hartree-Slater (RDHS) and the nonrelativistic approximate Herman-Skillman (AHS) calculations. From the comparison, it is concluded that the onset of L 1−L 3M 5 Coster-Kronig transition occurs at Z = 75 as predicted by the RDHS model based Coster-Kronig transition energy calculations.