Li (i = 1, 2, 3) sub‐shell fluorescence yields for 79Au, 80Hg and 81Tl

Abstract

AbstractThe Li (i = 1, 2, 3) sub‐shell x‐ray fluorescence yields (ωi) for 79Au, 80Hg and 81Tl were deduced from the measured cross‐sections for the Li (i = 1, 2, 3) sub‐shell x‐rays following ionization by 59.54 keV γ‐rays (B < Einc < BK) and for the L3 sub‐shell x‐rays following ionization by Rb K x‐rays (B < EKα < B, B < EKβ < BK), where B is the K shell/Li sub‐shell ionization threshold of the target element. An energy‐dispersive x‐ray fluorescence setup, involving photon sources consisting of a 241Am annular source in the direct and secondary excitation modes along with RbCl secondary exciter and an Si(Li) detector, was used for the measurements. The measured ω2 and ω3 values exhibit good agreement with those based on the relativistic Dirac–Hartree–Slater (RDHS) calculations, while the ω1 values are found to be higher by ∼25%. The present data indicate that the L1–L3 Coster–Kronig yield f13 based on the RDHS calculations are overestimated. Copyright © 2004 John Wiley & Sons, Ltd.