<i>AB INITIO</i> CALCULATIONS OF QUANTUM EFFECTS IN RARE-GAS CRYSTALS UNDER PRESSURE
Theoretical <i>ab initio</i> studies of quantum effects for compressed rare-gas crystals (RGC) by using K.B. Tolpygo?s model taking into account the deformation of electron shells in dipole approximation are represented. The energy of zero-point vibrations, mean-square displacement, and the Debye temperature for compressed hcp-Ne, -Ar, -Kr, and -Xe are calculated in harmonic approximation by using a dynamic matrix based on nonempirical short-range repulsion potential as well as the integration by the points of the principal value in the Brillouine zone. The resulted pressure dependence of the Debye temperature is in a good agreement with the experiment for Ne. The role of zero-point vibrations in the thermodynamics of the entire series of rare-gas crystals and, in particular, in the validity of the Lindeman melting criterion has been analyzed.