ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 29, Number 6
JKCSEZ 29(6)
December 20, 1985 

The total vibrational deexcitation rate constants kv,v-1 of HF(v = 5-7) by HF(v = 0) and DF(v = 9-12) by DF(v = 0) including both the vibration to vibration (V → V) and vibration to rotation and translation (V → R, T) energy transfer channels have been calculated semiclas-sically using a simplified collision model. The calculated results are in reasonably good agreement with those obtained by experimental and other theoretical studies. The rate constants increase with increasing temperature and also with increasing v. They also show that the relaxation of the highly excited HF and DF occurs predominantly via the V → R, T path at low temperature. The effectiveness of the V → V path, however, increases as the temperature is raised.