Abstract
The nonexponential magnetization recovery curve of solid CD 3COCD 2CH 3 is in good agreement with the theory of Hilt and Hubbard, which describes the spin—lattice relaxation of an isolated methyl group reorienting around its symmetry axis. The deviation from exponential spin—lattice relaxation behavior of ketones decreases with increasing chain length. Spin-diffusion breaks down the cross-correlations. Liquid CD 3COCD 2CH 3 also shows a nonexponential magnetization recovery curve. This is a consequence of the anisotropic motion of the methyl groups. This result is, to our knowledge, the first experimental evidence for the occurrence of nonexponential relaxation in liquids produced by anisotropic motion of methyl groups.
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