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The influence of the rotational state on the equation of state and the phonon frequency of solid molecular hydrogen has been studied experimentally under isochoric conditions at several densities. An analysis of the equation-of-state data has made it possible to separate the contributions from the isotropic and the anisotropic part of the interaction potential. In this way a previous model for the calculation of the anisotropic contribution, mainly of an electric quadrupole nature, could be confirmed. The change of the isotropic potential is given in terms of the parameters of the interaction potential due to Silvera and Goldman. Finally, a short analysis of the experimentally determined changes in phonon frequency is given.
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Driessen et al. (1987) studied this question.
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