Vibrational relaxation and line widths in liquids dephasing by intermolecular forces |
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Authors: | RM Lynden-Bell |
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Institution: | University Chemical Laboratory , Lensfield Road, Cambridge, CB2 1EW, U.K. |
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Abstract: | A theory of vibrational relaxation in liquids is presented in which the vibrations are loosely coupled to a bath or lattice of molecular translations and rotations by intermolecular forces. Using the second-order perturbation expressions familiar from magnetic resonance the secular contribution to the line width is calculated. Different coupling paths are considered and expressions given for the line widths in a liquid mixture in terms of number densities and diffusion coefficients valid when reorientation is slow and translation diffusional. |
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