Abstract
Hot hydrogen atoms have been produced by photolysis of HBr, HI, and H2S at 193 nm, and HI at 248 nm; D atoms were produced by photolysis of D2S at 193 nm. Vibrational excitation of CH3F in collisions with these hot atoms has been observed by detection of infrared emission at 3.3 μm (ν1, ν4) and 9.6 μm (ν3). Relative probabilities for excitation of these modes have been determined, and the ν3/ν1, ν4 ratio is much larger than is predicted by simple impulsive models. The ‘‘isotope effect,’’ i.e., relative excitation by H atoms compared to D atoms, is 1.4 for both vibrational modes.
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