Abstract
AbstractThe reorientational and vibrational correlation functions of the carbonyl stretching mode of ethyl trifluoroacetate have been determined from its infrared and Raman band shapes in solution in hexane, CCl4, CS2 and CHCl3. Reorientational motion is less hindered in hexane and CCl4 than in CS2 or CHCl3. Kubo and Rothschild's and Oxtoby's stochastic theories have been applied to describe the experimental correlation functions. An intermediate modulation regime is observed in the solvents used. The fastest modulation corresponds to CS2. Fisher and Laubereau's isolated binary collision model for vibrational dephasing does not account for the observed vibrational widths.
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