Abstract
After Langevin's method, orientational diffusion of a non-spherical particle is investigated. By use of this method the study of the molecular rotational motion is extended to that of axially symmetric molecules, in which the cross terms of angular velocity components are not neglected. The components of the rotational friction coefficient tensor are expressed quite generally. Angular autocorrelation functions are given by use of the distribution function. It is shown that the contribution of the precessional motion is never neglected at small time. The calculated results are compared with the experimental results of infrared absorption measurements.
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