Abstract

Intra and inter-molecular phonons play a central role in the relaxation dynamics of excitons in organic semiconductors In particular, coupling to lattice modes leads to self-localization and charge transfer reactions which become very efficient when they take place in the non-adiabatic regime, i.e. simultaneously with nuclear motion Vibrational coherent spectroscopy in the time domain is a useful tool for investigating such phenomena This technique requires pulses much shorter than the vibrational period and tunable in the visible in order to resonantly excite typical π-π* transitions.

© 1998 IEEE