The picosecond transient infrared spectrum of the lowest excited singlet (S1) state of trans-stilbene in an acetonitrile solution has been recorded in the fingerprint region. Several absorption bands (absorption coefficients ε ≤ 100) attributable to in-plane vibrations of the S1 species have been observed. A minor contribution of a polarized structure to the S1 state is suggested.
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Hiromi Okamoto (1998) studied this question.
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