Ultrafast studies on electron transfer in the betaines: evidence for local heating

Nancy E. Levinger; Alan E. Johnson; Gilbert C. Walker; Eva Akesson; Paul F. Barbara

doi:10.1117/12.58158

1 April 1992 Ultrafast studies on electron transfer in the betaines: evidence for local heating

Nancy E. Levinger, Alan E. Johnson, Gilbert C. Walker, Eva Akesson, Paul F. Barbara

Proceedings Volume 1638, Optical Methods for Time- and State-Resolved Chemistry; (1992) https://doi.org/10.1117/12.58158
Event: OE/LASE '92, 1992, Los Angeles, CA, United States

Abstract

We have made ultrafast time resolved pump probe measurements on the intramolecular electron transfer (ET) of the betaines, specifically betaine3O and penta-t-butyl betaine. The data have been analyzed to determine the ET rate in a range of solvent environments, at various temperatures and at a variety of pump and probe wavelengths. In all cases, the observed ET rate is fast, often faster than predicted by common ET theories. As a result, we have extended some common theories to successfully predict the measured ET rates. In addition to the ET dynamics, the data also display evidence for local heat deposition in the immediate vicinity of the betaine molecule which our extended model qualitatively predicts.

Citation Download Citation

Nancy E. Levinger, Alan E. Johnson, Gilbert C. Walker, Eva Akesson, and Paul F. Barbara "Ultrafast studies on electron transfer in the betaines: evidence for local heating", Proc. SPIE 1638, Optical Methods for Time- and State-Resolved Chemistry, (1 April 1992); https://doi.org/10.1117/12.58158

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