Elastic and nonelastic cross sections for Ar* ($sup 3$P)+HBr(X $sup 1$$Sigma$)
Journal Article
·
· J. Chem. Phys., v. 64, no. 1, pp. 89-94
OSTI ID:4083767
The energy dependence of the differential scattering of metastable Ar* ($sup 3$P) by ground state HBr(X $sup 1$$Sigma$) has been studied at four relative kinetic energies from 60--160 meV over an angular range of 4--120 deg c.m. The position and curvature of rainbow maxima, which are observed at each energy, are used to obtain LJ(12,6) potential parameters. The position of the minimum r/subm/=4.44+-0.8 A is the same as that for K+HBr, and the well depth, epsilon=25.2+-1.1 meV, is about 4% larger than epsilon (K+HBr). The scattered intensity shows a distinct falloff at large angles compared to that expected for elastically-scattered Ar*. This depletion, caused by quenching of Ar*, is analyzed in terms of an optical model to determine the threshold and energy dependence of the quenching cross section. The nonelastic cross section increases from a threshold of 25 meV to a nearly constant value of 41 A$sup 2$ at 160 meV. The optical analysis predicts a maximum of 42.5 A$sup 2$ at 215 meV. (AIP)
- Research Organization:
- Chemistry Department and the Radiation Laboratory, University of Notre Dame, Notre Dame, Indiana 46556
- NSA Number:
- NSA-33-021160
- OSTI ID:
- 4083767
- Journal Information:
- J. Chem. Phys., v. 64, no. 1, pp. 89-94, Journal Name: J. Chem. Phys., v. 64, no. 1, pp. 89-94; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
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