Collisional deactivation of laser-excited acetylene by H2, HBr, N2and CO
- 1 January 1981
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics
- Vol. 77 (3) , 469-476
- https://doi.org/10.1039/f29817700469
Abstract
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 ν3 and (ν2+ν4+ν5) of C2H2 at 3300 cm–1 the time dependence of the fluorescence signals from ν2(1974 cm–1) and ν5(729 cm–1) was investigated. The rate constants for the deactivation of ν2 and ν5 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 ν2 and ν5 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 (v= 1) by collision with C2H2 is very effective. The influence of the measured rates on the C2H2 laser is considered briefly.Keywords
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