2005, Vol.8, No.2, pp.134-147
A model of viscoelastic solvent is applied to describe
the vibrational energy transfer from a solute to the solvent. The
solute molecule is considered as a ``breathing'' sphere
interacting with the viscoelastic surrounding. The vibrational
excitation is shown to propagate into the solvent in the form of
viscoelastic spherical waves with absorbtion reducing with
increasing the frequency of the waves.
The vibrational energy relaxation rates are expressed
in terms of solvent viscoelastic parameters. Fractions of
propagated and absorbed energy are calculated as functions of
distance from the sphere centre. Comparison of the theoretically
predicted density dependence of the vibrational energy rate with
experimental data on azulene in propane at T = 400K is performed.
Key words:
vibrational energy transfer, breathing sphere,
viscoelastic medium
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