SINGLE-ELECTRON SUBPICOSECOND COHERENT DYNAMICS IN KBR F-CENTERS

The coherent dynamics of a vibronic wave packet in KBr F centers is pr esented. We observe the temporal evolution of single-electron wave pac kets following femtosecond laser excitation. Electron dynamics leads t o subpicosecond periodic oscillations of the sample transmission. Thes e are monitored in real time by pump-probe techniques yielding directl y the vibrational frequencies of the localized modes associated to gro und and excited electronic states. These results, complemented by stat ionary optical characterization, give further insight into the configu ration coordinate model for F centers.