束縛回転による核磁気緩和

概要

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A correlation function and a spectral density for hindered rotations in a crystal are calculated on the following assumptions. The potential barrier for the hindered rotations of molecules would not be invariable. A molecule oscillates almost always around an equilibrium orientation during a short average time τ_0', but this rarely occurs during a long average time τ_0. The calculated spectral density is approximately proportional to [numerical formula], where correlation time τ_c' and τ_c are equal to τ_0'/2 and τ_0, respectively and p is the probability that, a molecule might oscillate around an equilibrium orientation during a long average time τ_0. The result suggests that the rare phenomenon above mentioned might have a dominant effect on the spin lattice relaxation time. On the basis of this relaxation mechanism, the relaxation time of cetyl alcohol in the rotating state observed experimentally is discussed.
明治大学の論文