SVL fluorescence spectroscopy and collisionhyphen;induced intramolecular vibrational energy transfer in1B1difluorodiazirine

摘要

SVL fluorescence spectroscopy of1B1difluorodiazirine is used to confirm previously measured vibrational frequencies and to allow measurement of collision induced vibrational redistribution in1B1difluorodiazirine. 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 modehyphen;tohyphen;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 McDonaldndash;Rice model, but not with the Parmenterndash;Tang rules.