Observation du processus de transfert de charge intramoleculaire dans le 4-dimethylamino-4'-nitrostilbene (DNS) par spectroscopie CARS resolue en temps

摘要

Charge Transfert (CT) process of 4-dimethylamino-4'nitrostilbene in solution has been studied by "pump-probe" and transient CARS experiments with a 1 ps time resolution. While "pump-probe" experiments give good evidence for formation of CT state in polar solvent, CARS experiments reveal structural changes associated to CT process. In acetonitrile, a 37 cm~(-1) downshift of the NO_2 stretching mode is assigned to conformational relaxation of the Internal Charge Transfer state. In toluene such behavior is not observed correlated to the absence of CT stabilization in non-polar solvent.