Accession Number:

ADA165709

Title:

The Deactivation of HF(v = 3) by Water.

Descriptive Note:

Technical rept.,

Corporate Author:

AEROSPACE CORP EL SEGUNDO CA LAB OPERATIONS

Personal Author(s):

Report Date:

1985-12-31

Pagination or Media Count:

13.0

Abstract:

Water is often present as an impurity in HF chemical laser systems and can affect laser performance because of the large HF1 - H2O deactivation rate coefficient. Diatomic molecules have been found to deactivate the higher vibrational levels of HFv with rate coefficients that scale with v as v superscript n where n 2.7 when the deactivation process is exothermic. This scaling does not hold for HFv - H2 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 H2O has been measured to be faster than the deactivation rate of HFv 1 by H2O by a factor of 3.9. On the basis of a previously reported measurement of the HFv 1 - H2O rate coefficient, the deactivation rate coefficient of HFv 3 by H2O is estimated to be 16 microsecondsTorr, 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.

Subject Categories:

  • Lasers and Masers
  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE