Abstract

The direct photoinduced electron transfer of betaine-30 and related molecules has been studied by femtosecond pump-probe spectroscopy in the visible and near infrared, see Figure 1. The ultrafast pump-probe data have been analyzed to extract the time scales for thermal electron-transfer (DA → D⁺A⁻) and for vibrational cooling that occurs after the thermal electron transfer process.^{1, 2} These time scales have been measured in a broad range of solvents, over a large temperature range, in the liquid and solid state, e.g. see Figure 2. The talk will emphasize new unpublished variable wavelength pump-probe data on this system. This new data allows for a detailed analysis of the evolution of the spectral band shape during the electron transfer process.

© 1992 The Author(s)