Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5391262 | Chemical Physics Letters | 2006 | 6 Pages |
Abstract
We have studied the dynamics of intramolecular vibrational energy redistribution (IVR) from the initially excited mode ν1 (acetylene-type H-C bond) in H-CC-CH2Cl molecules in the gaseous phase by means of anti-Stokes spontaneous Raman scattering. The energy relaxation from ν1 due to IVR was estimated to occur on the time-scale Ï â 750 ps, which is one of the slowest IVR time-scales reported so far. The deactivation due to molecular collisions occurred with a rate constant of â8.5 μsâ1 Torrâ1, and was slower than the IVR process. A theoretical model which is based on the idea of statistical nature of couplings and incompleteness of IVR (expressed in the form of the so-called dilution factor) is proposed. The model provides rationalization for the observed kinetics and suggests that the IVR process is mediated by not only anharmonic but also vibrational-rotational interactions.
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
A.L. Malinovsky, Yu.S. Doljikov, A.A. Makarov, N.-D.D. Ogurok, E.A. Ryabov,