Diagram, valence-to-core, and hypersatellite Kβ X-ray transitions in metallic chromium

Faisal Zeeshan, Joanna Hoszowska, Jean Claude Dousse, Dimosthenis Sokaras, Tsu Chien Weng, Roberto Alonso-Mori, Matjaz Kavčič, Mauro Guerra, Jorge Miguel Sampaio, Fernando Parente, Paul Indelicato, José Pires Marques, José Paulo Santos

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We report on measurements of the Kβ diagram, valence-to-core (VtC), and hypersatellite X-ray spectra induced in metallic Cr by photon single and double K-shell ionization. The experiment was carried out at the Stanford Synchrotron Radiation Lightsource using the seven-crystal Johann-type hard X-ray spectrometer of the beamline 6-2. For the Kβ diagram and VtC transitions, the present study confirms the line shape features observed in previous works, whereas the K h β hypersatellite transition was found to exhibit a complex spectral line shape and a characteristic low-energy shoulder. The energy shift of the hypersatellite relative to the parent diagram line was deduced from the measurements and compared with the result of extensive multiconfiguration Dirac–Fock (MCDF) calculations. A very good agreement between experiment and theory was found. The MCDF calculations were also used to compute the theoretical line shape of the hypersatellite. A satisfactory agreement was obtained between the overall shapes of the experimental and theoretical spectra, but deviations were observed on the low- and high-energy flanks of the hypersatellite line. The discrepancies were explained by chemical effects, which were not considered in the MCDF calculations performed for isolated atoms.

Original languageEnglish
Pages (from-to)351-359
JournalX-Ray Spectrometry
Issue number5
Publication statusPublished - 1 Jan 2019


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