Dynamics of ultrafast internal conversion processes studied by femtosecond time-delayed photoelectron spectroscopy

Douglas R. Cyr; Carl C. Hayden

doi:10.1117/12.220869

18 September 1995 Dynamics of ultrafast internal conversion processes studied by femtosecond time-delayed photoelectron spectroscopy

Douglas R. Cyr, Carl C. Hayden

Author Affiliations +

Proceedings Volume 2548, Laser Techniques for State-Selected and State-to-State Chemistry III; (1995) https://doi.org/10.1117/12.220869
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

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.

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Douglas R. Cyr and Carl C. Hayden "Dynamics of ultrafast internal conversion processes studied by femtosecond time-delayed photoelectron spectroscopy", Proc. SPIE 2548, Laser Techniques for State-Selected and State-to-State Chemistry III, (18 September 1995); https://doi.org/10.1117/12.220869

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