Abstract
The femtosecond internal conversion (IC) of the tryptophan sidechain analog 5-methoxyindole (5MI) in hexadecane (HD) was observed using fluorescence upconversion. The time constant for internal conversion between 1L a and 1L b was estimated at 10–40 fs. A triple-exponential emission anisotropy decay, due to molecular reorientation, was also observed. The dependence of initial anisotropy upon excitation wavelength sets limits on 1L a vs. 1L b transition oscillator orientations.
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