Measurement of Br photofragment orientation and alignment from HBr photodissociation: Production of highly spin-polarized hydrogen atoms
- Department of Physics, University of Crete, P.O. 2208, 71003 Voutes-Heraklion (Greece)
The orientation and alignment of the {sup 2}P{sub 3/2} and {sup 2}P{sub 1/2} Br photofragments from the photodissociation of HBr is measured at 193 nm in terms of a{sub q}{sup (k)}(p) parameters, using slice imaging. The A {sup 1}{pi} state is excited almost exclusively, and the measured a{sub q}{sup (k)}(p) parameters and the spin-orbit branching ratio show that the dissociation proceeds predominantly via nonadiabatic transitions to the a {sup 3}{pi} and 1 {sup 3}{sigma}{sup +} states. Conservation of angular momentum shows that the electrons of the nascent H atom cofragments (recoiling parallel to the photolysis polarization) are highly spin polarized: about 100% for the Br({sup 2}P{sub 1/2}) channel, and 86% for the Br({sup 2}P{sub 3/2}) channel. A similar analysis is demonstrated for the photodissociation of HCl.
- OSTI ID:
- 20658012
- Journal Information:
- Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 15 Vol. 121; ISSN JCPSA6; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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