A COLLISIONAL ENERGY TRANSFER MAP INCLUDING $\Delta K$ PROCESSES IN $CH_{3}F$
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Date
1988
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Ohio State University
Abstract
Time resolved millimeter/submillimeter wave - infrared double resonance techniques were used to study rotational energy transfer in methyl fluoride. A Q-switched $CO_{2}$ laser pumped molecules into the $J=5, K=3, V_{3}=1$ state of $^{13}CH_{3}F$, and the time response of many absorption lines in the $V_{3}=1$ rotational manifold were monitored. An energy transfer map was obtained which includes state-to-state rates for two processes that change K-quantum number in addition to previously measured $\Delta J$ rates and vibrational relaxation rates. The first $\Delta K$ process, a vibrational swapping mechanism, effectively changes K in the $V_{3} =1$ vibrational state through collisions of nonthermal molecules in $V_{3} =1$ with thermal molecules in the ground vibrational state. The second is a direct collision induced transition and follows the selection rule $\Delta K=3n$. We have also obtained preliminary results on a similar study of $^{12}CH_{3}F$.
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Author Institution: Department of Physics, Duke University