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We have found that the isotropic peak position changes depending on the spinning rate of the sample in 63Cu, 65Cu, 79Br, and 127I magic-angle-spinning nuclear magnetic resonance (NMR) of cuprous halides, CuCl, CuBr, and CuI. With the increase in the spinning rate, the 63Cu and 65Cu signals shift towards lower frequencies, while the 79Br and 127I signals shift towards higher frequencies. The magnitudes of the frequency shift are in the following order: CuCl
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Hayashi et al. (1990) studied this question.
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