4.1 Article

Studies of the Kα X-ray spectra of low-density SiO2 aerogel induced by Ca projectiles for different penetration depths

期刊

HIGH ENERGY DENSITY PHYSICS
卷 3, 期 1-2, 页码 233-236

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ELSEVIER
DOI: 10.1016/j.hedp.2007.02.026

关键词

X-ray spectra; Dirac-Fock calculations; Line shapes, widths, and shifts

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The K alpha X-ray emission spectra of the low-density SiO2 aerogel target bombarded by Ca-48 ions with initial energy of 11.4 MeV/u were measured with a high spectral and spatial resolution along 80% of the ion beam stopping path. The Si K alpha L-0 diagram and K alpha L-n (up to n = 5) X-ray satellite lines corresponding to the radiative decays of atomic states with one hole in the K-shell and n-holes in the L-shell were measured. Energy shifts of the K alpha L-n satellites with respect to their diagram K alpha lines were determined and compared with the results of multiconfiguration Dirac-Fock (MCDF) calculations. The experimental energy shifts are smaller than values obtained from free-ion MCDF theory assuming an empty M-shell. The influence of the valence M-shell configuration on the satellite X-ray spectra is discussed. (C) 2007 Published by Elsevier B.V.

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