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What are the correct L‐subshell photoionization cross sections for quantitative X‐ray spectroscopy?
Author(s) -
Hönicke Philipp,
Kolbe Michael,
Beckhoff Burkhard
Publication year - 2016
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.2691
Subject(s) - photoionization , atomic physics , auger electron spectroscopy , spectroscopy , x ray photoelectron spectroscopy , photon , excitation , fluorescence , auger , photon energy , electron , auger effect , fluorescence spectroscopy , chemistry , photoelectric effect , physics , ionization , optics , nuclear physics , ion , nuclear magnetic resonance , organic chemistry , quantum mechanics
For fundamental parameter‐based, quantitative X‐ray fluorescence, X‐ray photoelectron spectroscopy or Auger electron spectroscopy, it is crucial to accurately know the photoionization cross sections (PCS). This atomic probability to absorb the exciting photon and eject a photoelectron, in general, followed by a subsequent decay resulting in the emission of a fluorescence photon or an Auger electron, strongly depends on the electron configuration and photon energy. Two contrary models for the photon energy dependence of the L‐subshell PCS, or the 2s, 2p ½ and 2p 3/2; energy levels, respectively, exist in the literature, and an experimental verification was not available until recently. In this work, the two models for calculating the PCS are discussed, and their influence on quantitative experiments is demonstrated by means of the fluorescence production cross sections for the three L shells. Depending on the excitation conditions, these fluorescence production cross sections and, thus, the derived quantitative results can differ significantly if the wrong PCS model is employed. Copyright © 2016 John Wiley & Sons, Ltd.