Abstract
A quantum-mechanical theory of the participation of pseudolocal modes in vibrational energy relaxation (VER) of molecules in solids is developed. A simple closed expression for the VER rate constant is derived in terms of the microscopic properties of the system. This expression is used to explore the role of local translational modes in a one-dimensional model. The results of model calculations are consistent with experimental findings for the system Cl2 isolated in rare-gas matrices.
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