Abstract
Vibrational energy transfer in ethylene and ethylene–rare-gas mixtures has been investigated. The ν11 (CH2 stretching) mode of ethylene has been excited by the pulses of an optical parametric oscillator with a wavelength of 3.3 μm. Fluorescence from the ν7 (CH2 wagging) mode at 10.5 μm has been detected. The resulting ν7 activation rate for pure ethylene is (267±27) ms−1 Torr−1. The ν7 activation rates of mixtures with rare gases are as follows: for He (13.8±2.7) ms−1 Torr−1, for Ne (16.2±4.9) ms−1 Torr−1, for Ar (32.8±2.6) ms−1 Torr−1, for Kr (34.7±12.1) ms−1 Torr−1, and for Xe (41.3±6.2) ms−1 Torr−1. The V–T/R relaxation rate of ν7 determined in our experiments is in good agreement with former measurements. Preliminary results on the fluorescence from the ν12 (CH2 scissors) mode at 6.9 μm show a ν12 deactivation rate of about 120 ms−1 Torr−1. Possible relaxation mechanisms are discussed.
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