Energy transfer processes in CH3F have been reinvestigated under high excitation conditions with and without added rare gas via a mathematical model developed as a consequence of studies under low excitation--The model can be used to describe energy transfer under high escitation conditions with the inclusion of an additional state and energy transfer pathways coupling that state to others in tbc model. A conclusion using this model is that population from 3113 does not signiticantly fil vl/va or L?(v~/Y~) even in the hi& excitation re8imc. It is also concluded that multiple photon absorption takes place under high excitation conditions.
Recently, CH,F has been studied under high excitation conditions using a TEA or focused, Q-switched CO? laser as the excitation source [4,6-S]. In these studies, temporal profiles for fluorescence emission from various CH3F vibrational states differ from the case of mild excitation_ In-one set of experiments V -+ V processes in CH,F were studied as a function of fluence and added rare gas [7,8]. An apparent conclusion of these studies was that some ener,g transfer pathways, unimportant at low levels of excitation, ' 1983-84 Visiting Fellow,