Abstract
The S1(1B2)–S0(1A1) electronic transition of m-difluorobenzene cooled in a supersonic free jet has been investigated in detail by use of laser induced fluorescence excitation and dispersed fluorescence spectroscopy. By analysis of over 50 vibronic transitions we have assigned 16 new S1 vibrational frequencies, and have confirmed seven previous assignments. This advances the total number of known S1 fundamental vibrational frequencies to 23 out of the possible 30. The assignments of two S0 frequencies have also been somewhat modified. Two different types of symmetry-forbidden transitions were identified: transitions involving one-quantum changes in b2 modes were found; and transitions involving combinations of b1 vibrations were observed to be unusually active in the vibronic spectrum. The observation of these forbidden transitions in both the fluorescence excitation and dispersed fluorescence spectra are explored in terms of first- and second-order vibronic coupling.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
