Abstract
The method described previously 2 for obtaining the relaxation times, normal coordinates and normal modes of relaxation of a non-ideal chemical system at constant temperature and pressure is extended to relaxation under adiabatic conditions and/or at constant volume; in each case the normal modes of relaxation are obtained as an orthonormal set satisfying orthonormality conditions similar to those pertaining to constant temperature and pressure. First-order perturbation theory is used for evaluating the various corrections required when the simple dilute-solution theory 1 is used at concentrations which are too high for the theory to be strictly applicable.

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