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Inelastic coherent neutron scattering and stimulated Brillouin scattering of light are discussed in the framework of first-order self-consistent theory of quantum crystals. The theory is applied to solid argon over the temperature range 4°–77°K and over a range of pressures from 0 to 200 atm. We show that anharmonic effects are substantial. Thermal expansion effects are identified and discussed separately. Our work is based on a (6–12) Lennard-Jones potential with parameters fixed to the sublimation energy and lattice constant of Ar at 0°K.
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Horton et al. (1970) studied this question.
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