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Reports results of a systematic experimental investigation of Cs 5p, Rb 4p and K 3p core excitation spectra in alkali-alkali alloys containing these atomic species. Various excitation profiles at threshold are observed. These apparently belong to a universal sequence of lineshapes. It is possible to predict which lineshape occurs in any particular alloy using a parameter xi which is a ratio of potential to kinetic energy in the excited configuration. An 'X-ray edge anomaly' occurs only in one limit of the sequence, namely xi large.
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Chiu et al. (1983) studied this question.
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