Dynamics of inelastic H+D2 collisions: Product quantum state distributions at 1.1 and 1.3 eV collision energy
- 1 September 1985
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 83 (5) , 2207-2213
- https://doi.org/10.1063/1.449313
Abstract
We have measured the quantum state distributions of rotationally and vibrationally excited D2 formed in inelastic H+D2 collisions at 1.1 and 1.3 eV, under effectively single‐collision conditions. The distributions are derived from highly time‐resolved CARS spectra of D2. The hydrogen atoms are generated by laser photolysis of HI in an HI/D2 gas mixture. The D2 produced in these inelastic collisions is less rotationally and vibrationally excited than the HD produced in reactive H+D2 collisions at the same energies. The results also show that at 1.3 eV the H+D2 cross section for producing vibrationally excited D2 is about one‐half the cross section for producing vibrationally excited HD. The measured D2 quantum state distributions are in excellent agreement with distributions derived from quasiclassical trajectory calculations on an ab initio H3 potential surface. However, the quasiclassical trajectory calculated ratio of the vibrationally inelastic nonreactive cross section to the vibrationally nonadiabatic reactive cross section is about 1.5.Keywords
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