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The authors report observation of slow beats in the envelope of spin-echo decays in the ¹⁹⁵Pt NMR of small particles Pt supported on alumina. The beats are shown to arise from the interplay between the Knight-shift inhomogeneity present in the small particles and the pseudoexchange coupling J between neighboring nuclear spins. J2π is found to be 4.2 kHz.
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Stokes et al. (1982) studied this question.
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