We present the picosecond time‐resolved resonance Raman (ps‐TR3) spectra of the first excited singlet state (S1) of cis‐stilbene (d0), fully deuterated cis‐stilbene (d12) and α,α′‐d2‐cis‐stilbene (d2) measured in hexane at pump and probe wavelengths 267 and 630 nm, respectively. The main observation is that in the lower wavenumber region the spectra are dominated by a second‐order overtone progression originating from a 229 cm−1 fundamental band for the S1d0 cis‐stilbene. The observed low‐wavenumber modes of the excited cis‐stilbene are substantially more resonantly enhanced than the modes around 1600 cm−1.
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Kwok et al. (2003) studied this question.
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