Comment on the determination of the intermolecular potential energy function of neon from spectroscopic,equilibrium and transport data |
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| Authors: | WL Taylor RA Aziz |
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| Institution: | 1. Monsanto Research Corporation , Mound Laboratory , Miamisburg, Ohio, 45342Mound Laboratory is operated by Monsanto Research Corporation for the U.S. Atomic Energy Commission under Contract No. AT-33-1-GEN-53.;2. Department of Physics , University of Waterloo , Waterloo, Ontario, Canada |
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| Abstract: | A quantum-mechanical treatment of the dynamics of relaxation of a twolevel mode coupled to a thermal bath is presented. The Zwanzig-Mori projection-operator formalism is employed to derive exact equations of motion for the correlation function  and the excess population  , where  and  are the coordinate and number operators associated with the two-level mode. In the van Hove weak-coupling limit it is shown that |G ν|2 and Δn decay exponentially with time constants τ and τ′, respectively. Explicit expressions for τ and τ′ are determined and the relationship between them clearly established. The application of the model to the specific problem of the effects of vibrational relaxation on isotropic Raman spectral lineshapes in dense media is emphasized. |
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