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Vibration—vibration equilibration in CH3F—NO,CO mixtures

✍ Scribed by S.M. Lee; A.M. Ronn

Publisher
Elsevier Science
Year
1974
Tongue
English
Weight
397 KB
Volume
26
Category
Article
ISSN
0009-2614

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✦ Synopsis

The rate of vibration to vibration energy transfer from CH3F excited to ~3 = 1 at 1050 cm-l to the nitric oxide and carbon monoxide fust vibrationally excited states at 1875 cm-1 and 2143 cm-t, respectively, has been measured. The V-V crossover rate was determined to be 5.5 -C 0.5 msec-r torr-' for NO and 0.244 c 0.004 for CO. These measurements demonstrate the capability of using the laser induced fluorescence technique for measurements of relaxation times vvith molecular species that are nor directly pumped by the laser (CO, NO), but rather acquire excitation from another long lived collision partner which is in turn Jaser excited (CHsF). The fact that CHaF is a polyatomic molecule with many infrared active modes is beneficial since many near resonant crossovers can be found for other species. Fluorescence from the parent CH3F species can usually be reduced or eliminated when desired by using appropriate interference filters.

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