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Diagram,valence-to-core,and hypersatellite Kβ X-ray transitions in metallic chromium |
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| Authors: | Faisal Zeeshan Joanna Hoszowska Jean-Claude Dousse Dimosthenis Sokaras Tsu-Chien Weng Roberto Alonso-Mori Matjaz Kav?i? Mauro Guerra Jorge Miguel Sampaio Fernando Parente Paul Indelicato José Pires Marques José Paulo Santos |
| Institution: | 1. Department of Physics, University of Fribourg, Fribourg, Switzerland;2. Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, USA;3. Linac Coherent National Accelerator Laboratory, SLAC National Accelerator Laboratory, Menlo Park, USA;4. Jo?ef Stefan Institute, Department of Low and Medium Energy Physics, Ljubljana, Slovenia;5. Laboratório de Instrumentação, Engenharia Biomédica e Física da Radiação (LIBPhys-UNL), Departamento de Física, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa, Caparica, Portugal;6. Space Radiation Environments, LIP-Laboratório de Instrumentação e Física Experimental de Partículas, Lisboa, Portugal;7. Laboratório de Instrumentação, Engenharia Biomédica e Física da Radiação (LIBPhys-UNL), Departamento de Física, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa, Caparica, Portugal
Laboratoire Kastler Brossel, Ecole Normale Supérieure, CNRS, Sorbonne Universités, UPMC Univ. 8. Paris 06, Paris, France;9. Laboratoire Kastler Brossel, Ecole Normale Supérieure, CNRS, Sorbonne Universités, UPMC Univ. 10. BioISI-Biosystems and Integrative Sciences Institute, Faculdade de Ciências da Universidade de Lisboa, Lisboa, Portugal |
| Abstract: | 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 Khβ 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. |
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