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Proceedings Paper

Dynamics of ultrafast internal conversion processes studied by femtosecond time-delayed photoelectron spectroscopy
Author(s): Douglas R. Cyr; Carl C. Hayden
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Paper Abstract

We have studied the dynamics of ultrafast internal conversion processes using femtosecond time-resolved photoionization and photoelectron spectroscopy. In hexatriene, following femtosecond pulse excitation at near 251 nm, we use time-delayed photoionization to observe the formation and decay of an intermediate species on the subpicosecond time scale. With time-resolved photoelectron spectroscopy, the rapid evolution of vibrational excitation in this intermediate is observed, as electronic energy is converted to vibrational energy in the molecule. The photodynamics of cis and trans isomers of hexatriene are compared and found to be surprisingly different on the 2 - 3 psec time scale. These results are important for understanding the fundamental photochemical processes in linear polyenes, which have served as models for the active chromophores of many biological photosystems.

Paper Details

Date Published: 18 September 1995
PDF: 12 pages
Proc. SPIE 2548, Laser Techniques for State-Selected and State-to-State Chemistry III, (18 September 1995); doi: 10.1117/12.220869
Show Author Affiliations
Douglas R. Cyr, Sandia National Labs. (United States)
Carl C. Hayden, Sandia National Labs. (United States)

Published in SPIE Proceedings Vol. 2548:
Laser Techniques for State-Selected and State-to-State Chemistry III
John W. Hepburn, Editor(s)

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