On the role of conical intersections in photodissociation. V. Conical intersections and the geometric phase in the photodissociation of methyl mercaptan
- Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218 (United States)
The geometric, or Berry, phase effect is particularly diabolical when it is associated with a conical intersection of two states of the same symmetry. A recently developed algorithm for determining a conical intersection of two states of the same symmetry provides the basis for a general approach for characterizing paths that give rise to the geometric phase effect in this instance. This approach is used, with wave functions in excess of 1.5 million configuration state functions, to determine a conical intersection and associated paths in the Franck{endash}Condon region of the photodissociation process CH{sub 3}SH({ital X}{sup 1}{ital A}{prime})+{ital h}{nu}{r_arrow}CH{sub 3}SH(1,2{sup 1}{ital A}{double_prime}){r_arrow}CH{sub 3}S+H or CH{sub 3}+SH. Derivative couplings along these paths are also determined. The implications for photodissociation dynamics are discussed. {copyright} {ital 1996 American Institute of Physics.}
- DOE Contract Number:
- FG02-91ER14189
- OSTI ID:
- 283808
- Journal Information:
- Journal of Chemical Physics, Vol. 104, Issue 20; Other Information: PBD: May 1996
- Country of Publication:
- United States
- Language:
- English
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