In a paper published in this Journal in 1971, relaxation curves for many binary mixtures of CS2, CH2, Cl2, CH2Br2, C6H6, and CCl4were presented, but no attempt was made to interpret these results quantitatively. It has always been our intention to interpret these results in a following paper. In the present paper, it is found that reaction rates for vibrational relaxation energy exchange varied considerably with concentration in many binary mixtures. For those mixtures where variations of reaction rates are strongly dependent on concentration, an empirical formula has been found. Although this variation in reaction rates was empirically determined at low frequency, theory shows that reaction rates, though concentration dependent, should be independent of driving frequency. We have therefore used the empirically determined reaction rates in dichloromethanehyphen;carbon tetrachloride to predict relaxation curves of this mixture over frequencies and concentrations where the strength of relaxation is very sizable.
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