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Quantum rotational excitation energies in phase II of solid CH 4 consisting of only A-spin species are calculated using the extended James-Keenan model. It is shown that the first excited rotational levels of the D 2d and O h molecules split into six levels at wavevector k=0. This result is compared with classical lattice dynamical calculations.
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Kobashi et al. (1984) studied this question.
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