Magnetic field effect on recombination of C1 atom pairs in solid hydrocarbon films: The role of spin-orbit coupling
- Univ. of Utah, Salt Lake City, UT (United States)
Ultraviolet laser photolysis of glassy solid solutions of chlorine and methycyclopropane at 77 K yield hydrogen chloride and chloromethylcyclopropane as free radical chain reaction products. Samples subjected to weak magnetic fields exhibit a reduction in photochemical quantum yield from 180 {+-} at zero field to 70 {+-} 5 at 300 Gauss. At higher fields, the quantum yield increases, reaching a plateau of 120 {+-} 10 between 1000 and 3000 Gauss. The magnetic effect is attributed to field-dependent transitions between spin-orbit states of the C1 atom pair that are coupled by nuclear hyperfine interactions. The authors show that contrary to a popular belief, strong spin-orbit coupling in radical pairs does not necessarily diminish magnetic field effects.
- OSTI ID:
- 141401
- Report Number(s):
- CONF-930304-; TRN: 93:003688-1078
- Resource Relation:
- Conference: 205. American Chemical Society national meeting, Denver, CO (United States), 28 Mar - 2 Apr 1993; Other Information: PBD: 1993; Related Information: Is Part Of 205th ACS national meeting; PB: 1951 p.
- Country of Publication:
- United States
- Language:
- English
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