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- W2016799686 abstract "Resonance Raman (RR) spectra are presented for p-nitroazobenzene dissolved in chloroform using 18 excitation wavelengths, covering the region of 1(n → π*) electronic transition. Raman intensities are observed for various totally symmetric fundamentals, namely, C−C, C−N, NN, and N−O stretching vibrations, indicating that upon photoexcitation the excited-state evolution occurs along all of these vibrational coordinates. For a few fundamentals, interestingly, in p-nitroazobenzene, it is observed that the RR intensities decrease near the maxima of the resonant electronic 1(n → π*) transition. This is attributed to the interference from preresonant scattering due to the strongly allowed 1(π → π*) electronic transition. The electronic absorption spectrum and the absolute Raman cross section for the nine Franck−Condon active fundamentals of p-nitroazobenzene have been successfully modeled using Heller's time-dependent formalism for Raman scattering. This employs harmonic description of the lowest energy 1(n → π*) potential energy surface. The short-time isomerization dynamics is then examined from a priori knowledge of the ground-state normal mode descriptions of p-nitroazobenzene to convert the wave packet motion in dimensionless normal coordinates to internal coordinates. It is observed that within 20 fs after photoexcitation in p-nitroazobenzene, the NN and C−N stretching vibrations undergo significant changes and the unsubstituted phenyl ring and the nitro stretching vibrations are also distorted considerably." @default.
- W2016799686 created "2016-06-24" @default.
- W2016799686 creator A5022355698 @default.
- W2016799686 creator A5029478842 @default.
- W2016799686 creator A5088034696 @default.
- W2016799686 date "2002-09-18" @default.
- W2016799686 modified "2023-10-14" @default.
- W2016799686 title "Investigation of Short-Time Isomerization Dynamics in<i>p</i>-Nitroazobenzene from Resonance Raman Intensity Analysis" @default.
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- W2016799686 doi "https://doi.org/10.1021/jp0108162" @default.