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>The threehyphen;photon spectrum of the1B2ularr;1A1gtransition in benzene: Analysis of vibronic and rotational structure
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The threehyphen;photon spectrum of the1B2ularr;1A1gtransition in benzene: Analysis of vibronic and rotational structure
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机译：The threehyphen;photon spectrum of the1B2ularr;1A1gtransition in benzene: Analysis of vibronic and rotational structure
A vibrational and rotational analysis of the threehyphen;photon fluorescence excitation spectrum of the1B2ularr;1A1gtransition in gashyphen;phase benzene is presented. The group theoretically allowed origin and any associated vibrational structure are absent. In addition, there is no evidence for any rotational structure based on a rankhyphen;three transition tensor. Coherent loss mechanisms are carefully considered and then rejected as possible interferences in the threehyphen;photon fluorescence spectrum. Polarization measurements and observed vibronic structure indicate a dominant rank one (vibronic) contribution to the threehyphen;photon cross section. The lack of threehyphen;photon allowed structure in this1B2ularr;1A1gtransition of benzene is consistent with the pseudoparity selection rules of alternant hydrocarbon theory, yet such strict adherence to them would seem surprising. The appearance of thee2gmode ngr;8in the threehyphen;photon spectrum marks the first experimental determination of its frequency in the1B2ustate.
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