VIBRATIONAL DEPHASING IN THE GAUCHE AND TRANS CONFORMERS OF 1,2-DIBROMOETHANE
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Publisher:Ohio State University
The isotropic Raman spectra of the gauche and trans C-Br stretching modes in 1,2-dibromoethane were studied as a function of temperature in the liquid phase. Isotropic dephasing times were found to be longer for the gauche conformer, and decreased at higher temperatures for both rotamers. Application of the ‘isolated binary collison’ model to this system could not reproduce the experimentally observed temperature dependence of the isotropic correlation times. However, values of the modulation times obtained from the Kubo lineshape formalism are in qualitative agreement with collision times calculated from the Enskog hard-sphere model. The above results are compared with preliminary data on other simple haloalkanes.
This research was supported by the Robert A. welch Foundation (Grant B-657)
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