Premium
Synchrotron radiation induced X‐ray production cross sections of 66 Dy at energies across its L i ( i = 1–3 ) subshell absorption edges
Author(s) -
Kaur Rajnish,
Kumar Anil,
Czyzycki M.,
Migliori A.,
Karydas A.G.,
Puri Sanjiv
Publication year - 2017
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.2800
Subject(s) - photoionization , atomic physics , synchrotron radiation , physics , absorption (acoustics) , x ray , chemistry , ion , nuclear physics , ionization , optics , quantum mechanics
The X‐ray production (XRP) cross sections for the 66 Dy L k (k = l, α, η, β 2,6,7,15 , β 1,6 , β 1,3,4,6 , β 2,7,15 , γ 1,5 , γ 2 , 3 ) emission lines have been measured by tuning the incident synchrotron radiation at energies over the range 7.8–9.2 keV and ~10–370 eV above the respective L i ( i = 1–3) absorption edges. These measurements aim to check the reliability of the independent particle approximation models used to generate the theoretical data sets of different physical parameters required to calculate the XRP cross sections and also investigate the influence of many body effects on the photoionization process. The measured values have been compared with 4 sets of XRP cross sections calculated using the Dirac–Fock model‐based X‐ray emission rates, 2 sets of the L i ( i = 1–3) subshell photoionization cross sections deduced from the self‐consistent Dirac–Hartree–Fock model‐based values and the nonrelativistic Hartree–Fock–Slater model‐based values, and 2 sets of the fluorescence (ω i ) and Coster–Kronig (f ij ) yields. The present measured Lγ 2,3 (originating from decay of the L 1 subshell vacancies) XRP cross sections are found to be significantly higher than different sets of theoretical values, whereas a good agreement is generally observed for the various other XRP cross sections and relative intensities.