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Proceedings Paper

Photochemical and spectroscopic studies of small model polyenes related to vision
Author(s): Anne B. Myers; David Lee Phillips; Xiaopei Ci; Curtis L. Westerfield; Jon-Marc Rodier
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Paper Abstract

The photochemistry of vision involves the ultrafast cis-trans photoisomerization and efficient excited-state deactivation of a polyene aldehyde chromophore. We have been studying the photophysics of smaller model systems that also exhibit some of these properties. Resonance Raman and preliminary picosecond time-resolved absorption experiments on butadiene and cis- and trans-1,3,5-hexatriene in vapor and solution phases have been analyzed to characterize the structure and dynamics of both the optically allowed B state and the lowest singlet excited A state. Solvent polarizability is found to have a large effect on the B-state torsional potentials, particularly in trans-hexatriene. Related studies including picosecond two-color pump-probe Raman measurements on the ultrafast photoreactions of cis-stilbene are also described. These experiments probe the initial vibrational energy distribution and subsequent relaxation of the initially formed trans-stilbene, as well as the partitioning between the cis-trans isomerized and ring-closed products. Significant solvent polarity effects are observed on both the excited-state photochemistry and the ground-state vibrational relaxation.

Paper Details

Date Published: 1 May 1993
PDF: 12 pages
Proc. SPIE 1890, Biomolecular Spectroscopy III, (1 May 1993); doi: 10.1117/12.145245
Show Author Affiliations
Anne B. Myers, Univ. of Rochester (United States)
David Lee Phillips, Univ. of Rochester (United States)
Xiaopei Ci, Univ. of Rochester (United States)
Curtis L. Westerfield, Univ. of Rochester (United States)
Jon-Marc Rodier, Univ. of Rochester (United States)

Published in SPIE Proceedings Vol. 1890:
Biomolecular Spectroscopy III
Laurence A. Nafie; Henry H. Mantsch, Editor(s)

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