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Ultrafast Vibrational Relaxation Processes Induced by Intramolecular Excited State Hydrogen Transfer by Matteo Rini; Jens Dreyer; Erik T.J. Nibbering; Thomas Elsaesser is a scholarly article available to read on EtoBox.

What is Ultrafast Vibrational Relaxation Processes Induced by Intramolecular Excited State Hydrogen Transfer about?

Vibrational spectra between 1000 and 1700 cm À1 are studied after ultrafast transfer of a hydrogen atom in the excited state of 2-(2 0 -hydroxyphenyl)benzothiazole. Femtosecond pump-probe experiments reveal new vibrational bands of the keto-S 1 state, including the carbonyl stretching band formed by hydrogen transfer. Such bands display a negligible spectral reshaping but blue-shift by up to 7 cm À1 following biexponential kinetics with time constants of 700 fs and 15 ps. The blue-shift is attributed to the anharmonic coupling of the fingerprint vibrations to Raman-active low-frequency modes that are excited upon electronic excitation and depopulated by intramolecular redistribution and cooling to the solvent.

Author

Matteo Rini; Jens Dreyer; Erik T.J. Nibbering; Thomas Elsaesser

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0009-2614)

Published

2003

Language

EN