Large, temperature-dependent line shifts and asymmetric line broadenings have been observed in recoilless nuclear resonance spectra of several rare-earth compounds. The shifts are shown to be due to a second-order magnetic hyperfine interaction, while the broadenings are partially attributed to electron spin-spin relaxation. A detailed theoretical analysis of the line shifts is presented and shown to agree well with experimental observations in TmCl₃·{}6H₂O.
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Clauser et al. (1969) studied this question.
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