title: Experimental verification of the individual energy dependencies of the partial L-shell photoionization cross sections of Pd and Mo.
abstract: An experimental method for the verification of the individually different energy dependencies of L(1)-, L(2)-, and L(3)- subshell photoionization cross sections is described. The results obtained for Pd and Mo are well in line with theory regarding both energy dependency and absolute values, and confirm the theoretically calculated cross sections by Scofield from the early 1970 s and, partially, more recent data by Trzhaskovskaya, Nefedov, and Yarzhemsky. The data also demonstrate the questionability of quantitative x-ray spectroscopical results based on the widely used fixed jump ratio approximated cross sections with energy independent ratios. The experiments are carried out by employing the radiometrically calibrated instrumentation of the Physikalisch-Technische Bundesanstalt at the electron storage ring BESSY II in Berlin; the obtained fluorescent intensities are thereby calibrated at an absolute level in reference to the International System of Units. Experimentally determined fixed fluorescence line ratios for each subshell are used for a reliable deconvolution of overlapping fluorescence lines. The relevant fundamental parameters of Mo and Pd are also determined experimentally in order to calculate the subshell photoionization cross sections independently of any database.
authors.affiliation: Physikalisch-Technische Bundesanstalt (PTB), Abbestraße 2-12, 10587 Berlin, Germany.
authors.forename: Philipp
authors.initials: P
authors.lastname: Hönicke
authors.affiliation: Physikalisch-Technische Bundesanstalt (PTB), Abbestraße 2-12, 10587 Berlin, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Kolbe
authors.affiliation: Physikalisch-Technische Bundesanstalt (PTB), Abbestraße 2-12, 10587 Berlin, Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Müller
authors.affiliation: Rigaku Corporation, 4-14-4, Sendagaya, Shibuya-Ku, Tokyo 151-0051, Japan.
authors.forename: Michael
authors.initials: M
authors.lastname: Mantler
authors.affiliation: AXO DRESDEN GmbH, Gasanstaltstraße 8b, 01237 Dresden, Germany.
authors.forename: Markus
authors.initials: M
authors.lastname: Krämer
authors.affiliation: Physikalisch-Technische Bundesanstalt (PTB), Abbestraße 2-12, 10587 Berlin, Germany.
authors.forename: Burkhard
authors.initials: B
authors.lastname: Beckhoff