SVL fluorescence spectroscopy and collision-induced intramolecular vibrational energy transfer in 1<i>B</i>1 difluorodiazirine

Abstract

SVL fluorescence spectroscopy of 1B1 difluorodiazirine is used to confirm previously measured vibrational frequencies and to allow measurement of collision induced vibrational redistribution in 1B1 difluorodiazirine. The latter is found to have the following properties: (i) The cross section is large, of the order of one percent of the hard sphere collision cross section; (ii) The observed mode-to-mode energy transfer is very selective; (iii) The pathways for energy exchange appear not to be influenced by the symmetries of the initial and final levels; (iv) The data are qualitatively consistent with the predictions of the McDonald–Rice model, but not with the Parmenter–Tang rules.