Computation of Raman-Scattering Cross Sections in Rare-Gas Crystals. II. Helium

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Abstract
One- and two-phonon Raman-scattering efficiencies are computed for the hcp phase of solid helium, following a theoretical model used previously for neon and argon. Attention is given to the dependence of the efficiencies on photon polarizations, photon energy loss, and crystal density. Two-phonon efficiencies are also computed for the bcc phase, and critical points are identified.