The deactivation of vibrationally excited acetylene by collisions with H2, HBr, N2 and CO was studied using the laser-induced fluorescence technique. After excitation of the coupled modes ?3 and (?2 + ?4 + ?5) of C2H2 at 3300 cm-1 the time dependence of the fluorescence signals from ?2 (1974 cm-1) and ?5 (729 cm-1) was investigated. The rate constants for the deactivation of ?2 and ?5 by the collision partners CO and N2 were found to be relatively low and comparable with the known corresponding rate constants for rare-gas collisions. On the other hand the measured rate constants for the deactivation ?2 and ?5 by collisions with H2 and HBr are much higher. Additional measurements of CO fluorescence near 4.7 µm showed that the activation and deactivation of CO (? = 1) by collision with C2H2 is very effective. The influence of the measured rates on the C2H2 laser is considered briefly.
|Number of pages||8|
|Journal||Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics|
|Publication status||Published - 1981|