Abstract
The infrared absorption band shape of the ν 8 mode of dichloromethane has been measured carefully in twelve kinds of solvent. The rotational correlation functions have been calculated by the Fourier transformation of the observed band shapes, and the solvent effect on those functions has been discussed. The correlation functions show non-exponential decays in a short time range for any solutions, and this indicates that the molecular motions do not obey a simple rotational diffusion model. On the other hand, the correlation functions in a longer time region show clear-cut exponential decays for various solutions, and the relaxation times in the exponential decays have been evaluated. Quite a linear relationship has been observed between the relaxation times and the viscosities of the solvents used, and the effect of the solvent viscosity on the rotational motion of the solute molecule hea been investigated.
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