A model is suggested to describe molecular reorientation in phases where rotation is strongly hindered. The model is based on simple librational motion of each molecule within an effective potential energy well. The relaxation of orientational correlation is related to distribution functions for angular velocity and librational frequency, and it is found that this decay can be simply related to the angular velocity correlation function. The model is then applied to molecular dynamics simulations of reorientation in dense media. The role of librational motion in reorientation is discussed.
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Joseph N. Kushick (1977) studied this question.
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