Abstract
Abstract The high temperature behavior of the longitudinal proton spin relaxation time T1 of several methyl naphthalene crystals, differing in the arrangement and number of the substituted CH3-groups, was investigated in a large magnetic field range. It could be prooved - for the first time via proton spin relaxation - that in solids the fast reorientation of CH3-groups with low hindering barriers can lead to remarkable contributions to the total relaxation rate by spin-rotational interaction, in addition to the well known dipolar interaction discussed in preceeding works.
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