Abstract
Modified neglect of differential overlap-Configuration interaction (MNDO-CI) calculations of the low-lying electronically excited states and the electronic ground state of stilbene have been performed. The dependences of the potential energy on the angle of rotation around the central ethylene bond, on the length of this bond, and on the twist angle of the two phenyl groups are explored. There is no evidence for a nonadiabatic participation of the doubly excited ‘‘phantom state’’ in the photoisomerization dynamics. Instead, the calculated properties of the singly excited 1 1B state support a mechanism with adiabatic rotation around the central ethylene bond to the perpendicular conformation, followed by internal conversion. There appears to be a small ‘‘CI-induced’’ energy barrier along this pathway which will be overcome by the combined motion in several coordinates. Therefore, a complicated activated complex structure arises.
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Dates
Type | When |
---|---|
Created | 23 years ago (July 26, 2002, 9:20 a.m.) |
Deposited | 1 year, 6 months ago (Feb. 10, 2024, 2:50 a.m.) |
Indexed | 5 months ago (March 19, 2025, 11:57 a.m.) |
Issued | 37 years, 2 months ago (June 1, 1988) |
Published | 37 years, 2 months ago (June 1, 1988) |
Published Print | 37 years, 2 months ago (June 1, 1988) |
@article{Troe_1988, title={MNDO calculations of stilbene potential energy properties relevant for the photoisomerization dynamics}, volume={88}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.454402}, DOI={10.1063/1.454402}, number={11}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Troe, J. and Weitzel, K.-M.}, year={1988}, month=jun, pages={7030–7039} }