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L i ( i = 1, 2, 3) sub‐shell fluorescence yields for 79 Au, 80 Hg and 81 Tl
Author(s) -
Sharma Manju,
Singh Prem,
Shahi J. S.,
Mehta D.,
Singh Nirmal
Publication year - 2004
Publication title -
x‐ray spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.447
H-Index - 45
eISSN - 1097-4539
pISSN - 0049-8246
DOI - 10.1002/xrs.784
Subject(s) - electron shell , atomic physics , l shell , ionization , physics , fluorescence , shell (structure) , excitation , analytical chemistry (journal) , chemistry , ion , materials science , optics , earth's magnetic field , chromatography , quantum mechanics , magnetic field , composite material
Abstract The L i ( i = 1, 2, 3) sub‐shell x‐ray fluorescence yields (ω i ) for 79 Au, 80 Hg and 81 Tl were deduced from the measured cross‐sections for the L i ( i = 1, 2, 3) sub‐shell x‐rays following ionization by 59.54 keV γ‐rays ( B L 1< E inc < B K ) and for the L 3 sub‐shell x‐rays following ionization by Rb K x‐rays ( B L 3< E Kα < B L 2, B L 1 /L 2< E Kβ < B K ), where B K/L iis the K shell/L i sub‐shell ionization threshold of the target element. An energy‐dispersive x‐ray fluorescence setup, involving photon sources consisting of a 241 Am 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 ω 2 and ω 3 values exhibit good agreement with those based on the relativistic Dirac–Hartree–Slater (RDHS) calculations, while the ω 1 values are found to be higher by ∼25%. The present data indicate that the L 1 –L 3 Coster–Kronig yield f 13 based on the RDHS calculations are overestimated. Copyright © 2004 John Wiley & Sons, Ltd.