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Beam-foil spectroscopy in the extreme UV of highly ionized silicon Si XI and the isoelectronic ions AI X, S XIII and Ar XV, S Khardi, M C Buchet-Poulizac, J P Buchet, M Carré, A Denis, J Désesquelles, A E Livingston, S Martin, Y Ouerdane
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Khardi et al. (1994) studied this question.
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