State-to-state vibrational energy transfer from 61 benzene induced by low-energy collisions with nitrogen: Temperature-dependent propensities

Eric R. Waclawik, Warren D. Lawrance, Rodney A.J. Borg

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    State-to-state rate constants for vibrational energy transfer from the 61 level of S1 benzene induced by collisions with N2 have been measured as a function of temperature in the range 41-13 K in a supersonic free jet expansion. It is found that there is a change in the propensity for transfer into the destination channels as the temperature is decreased. The efficiency of transfer to the 162 level increases by a factor of ∼2 compared with transfer to the spectrally unresolved pair of levels 111/161 with the decrease in temperature over this range. Comparison with the room temperature results of Parmenter and Tang (Chem. Phys. 1978, 27, 127) shows that the branching ratio of 162 to 111/161 increases from <0.18 at room temperature to ∼1.0 at 13 K. The increase in propensity for 162 occurs despite the fact that transfer to this level involves a total change in vibrational quanta of 3, compared with 2 for 111 and 161. The trend in the state-to-state propensities for collision-induced vibrational energy transfer from 300 to 13 K suggests that they are approaching those seen in van der Waals predissociation as the temperature approaches 0 K.

    Original languageEnglish
    Pages (from-to)5798-5802
    Number of pages5
    JournalJournal of Physical Chemistry
    Issue number22
    Publication statusPublished - 1 Jun 1993


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