Abstract
The application of the Morse potential function to the rare-gas solids has been investigated by studying their lattice dynamics. A quasiharmonic central force model has been used. It estimates zero-point energy and its derivatives by Debye theory and includes them in calculation by an iteration method. Frequency distribution and dispersion curves have been calculated both with one neighbour and twelve neighbours interactions. The agreement between the results obtained with Morse potential and other various ( n, 6) and (exp, 6) potentials is not very satisfactory. The comparison of the theoritical and experimental results show that the function underestimates the contribution of distant neighbours, but may be used to study the rare gas solids after suitably modifying the attractive term.
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