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Reaction dynamics, OH energy partitioning, and OH product angular momentum alignment studies: H+H2O→OH+H2 versus H+CO2→OH+CO

✍ Scribed by A. Jacobs; H.-R. Volpp; J. Wolfrum

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
813 KB
Volume
218
Category
Article
ISSN
0009-2614

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✦ Synopsis

Using translationally

excited H atoms generated by laser photolysis of H2S at 193 nm, the reaction dynamics of H + H,O+OH + H2 and H + COIdOH + CO was investigated at collision energies of 2.2 and 2.3 eV, respectively. Nascent OH rotational and vibrational quantum-state distributions and OH product translational energies were measured by means of the laser photolysis/laser-induced fluorescence pump-probe technique. A markedly non-statistical distribution of the available energy was found: H+H1O+OH+H1: f,,=O.O4+0.01,

10m3, f-,=0.65+0.26; H+CO,+OH+CO: f,,= 0.14 f 0.02, ftib = 0.11 f 0.04, l;_S= 0.59 k 0.16. In addition, velocity-aligned H atoms generated via polarized HZ!3 photodissociation were used to investigate vector correlations for both reactions.

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The title reaction was studied under single-collision conditions using 227-285 nm HI photolysis. A large decrease in the OH yield was obsenred as the photolysis wavelength was increased. Rotational distributions were obtained at 227,239,251,263 and 280 MI. Similar yield versus wavelength data were o