Deactivation of HF(v = 3) by water. Technical report
Water is often present as an impurity in HF chemical laser systems and can affect laser performance because of the large HF(1) - H/sub 2/O deactivation rate coefficient. Diatomic molecules have been found to deactivate the higher vibrational levels of HF(v) with rate coefficients that scale with v as v /sup n/ where n = 2.7 when the deactivation process is exothermic. This scaling does not hold for HF(v) - H/sub 2/ collisions in which the primary deactivation process is an endothermic V-V transfer with the endothermicity increasing with v. The room temperature (T = 295 K) deactivation rate of HF (v = 3) by H/sub 2/O was measured to be faster than the deactivation rate of HF(v = 1) by H/sub 2/O by a factor of 3.9. On the basis of a previously reported measurement of the HF(v = 1) - H/sub 2/O rate coefficient, the deactivation rate coefficient of HF(v = 3) by H2O is estimated to be 16 ..mu..sec/Torr, which is a factor of 3 faster than the hard-sphere collision rate. The theoretical implication of this fast-rate coefficient are reviewed. Keywords: Chemical kinetics; Vibrational deactivation.
- Research Organization:
- Aerospace Corp., El Segundo, CA (USA). Laboratory Operations
- OSTI ID:
- 5537541
- Report Number(s):
- AD-A-165709/7/XAB; TR-0086(6603)-1
- Country of Publication:
- United States
- Language:
- English
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