In the electron spin resonance spectra of some lanthanon impurities in CaF2 the lines are flanked by satellites which are due to transitions in which a neighbouring fluorine nucleus flips with the electron. The theory of these transitions is discussed and applied to the analysis of the satellite structure in the spectrum of Ce3+ in CaF2. It appears that the coupling between the electron and the fluorine ion includes some s-contact character. There is evidence for the presence of a neighbouring interstitial fluorine ion to compensate for the extra positive charge on the Ce3+ ion.
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Baker et al. (1960) studied this question.
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