The vacuum ultraviolet excited electronic states of 1,3-butadiene: Selective enhancement of vibrational modes in resonant Raman transitions

Gary D. Strahan, Bruce S. Hudson

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The assignments of many of the vacuum ultraviolet valence and Rydberg states of trans-1,3-butadiene are investigated using resonance Raman spectroscopy which provides data on distortions and vibronic activity. The 1Bg(π-3s) Rydberg state (50 144 cm-1) is confirmed to be vibronically coupled to the 1 1 Bu(π π*) valence state by modes of au symmetry, especially V 12 (CH2 twist). The higher energy Rydberg states were also examined and an analysis was made of both their assignments and their behavior when resonantly enhanced. Selective excitation into the sharp vibrational structure of these Rydberg states provides a striking example of mode specific resonance enhancement. Evidence was sought for the location of the high energy 1Ag (ππ*) state, said to be near 60 000 cm-1, but the results were indefinite.

Original languageEnglish (US)
Pages (from-to)5780-5789
Number of pages10
JournalThe Journal of Chemical Physics
Issue number8
StatePublished - Jan 1 1993


ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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