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Picosecond transient Raman spectra of photoexcited 4‐dimethylamino‐4′‐nitrostilbene in polar solvents
Author(s) -
Nakabayashi T.,
Okamoto H.,
Tasumi M.
Publication year - 1995
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250260834
Subject(s) - raman spectroscopy , picosecond , raman scattering , excited state , chemistry , photochemistry , ultrafast laser spectroscopy , analytical chemistry (journal) , materials science , atomic physics , laser , optics , physics , organic chemistry
Picosecond transient Raman spectra of photoexcited 4‐dimethylamino‐4′‐nitrostilbene in polar solvents (acetonitrile, acetone and benzonitrile) were observed and the decay kinetics of the observed Raman bands were analysed. The observed solvent dependences of the peak positions suggest that the transient Raman bands arise from a non‐radiative charge‐transfer (CT) state. Molecules in the vibrationally excited CT states were also observed by monitoring transient anti‐Stokes Raman scattering. These results indicate that a rapid non‐radiative transition occurs from the lowest allowed singlet state to vibrationally excited CT states.