RECENT DEVELOPMENTS IN ULTRAFAST TIME-RESOLVED VIBRATIONAL SPECTROSCOPY OF ELECTRONICALLY EXCITED STATES

摘要

Developments of three new time-resolved vibrational spectroscopies and their applications to electronically excited states are reviewed. Transform- limited picosecond time-resolved Raman spectroscopy has been used to study the vibrational dynamics of trans-stilbene in the lowest excited sin- glet state. Picosecond time-frequency two-dimensional multiplex Coherent Antistokes Raman Scattering spectroscopy has been used to probe the struc- ture of diphenylacetylene in the lowest and the second lowest excited singlet states. Nanosecond time-resolved dispersive infrared spectroscopy has de- tected the singlet and triplet intramolecular charge transfer states of 4-(di- methylamino)benzonitrile. Strong evidence for a charge transfer structure has been obtained.