Population dynamics of vibrational modes in stilbene-3 upon photoexcitation to the first excited state

• Published in: Chemical physics letters Vol. 408; no. 1; pp. 37 - 43
• Main Authors: Maksimenka, R., Dietzek, B., Szeghalmi, A., Siebert, T., Kiefer, W., Schmitt, M.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 07.06.2005
• ISSN: 0009-2614; 1873-4448
• DOI: 10.1016/j.cplett.2005.03.137

The vibrational energy redistribution due to the geometrical rearrangement induced by photoexcitation of stilbene-3 into the S 1 state is monitored selectively with respect to the different forms of nuclear motion in this polyatomic system. The femtosecond time-resolved, pump-CARS scheme is employed to trace the population flow between vibrational modes associated with this structural rearrangement. The decay of the signal at 1189–1333 cm −1 is attributed to vibrational cooling with population flowing out of these modes, whereas the rise observed at 1600 cm −1 is attributed to reorganization of the respective bonds due to the transition from the S 0 to the S 1 state geometry.