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Quenching of N/sub 2/(a /sup 1/Pi/sub g/, v' = 0) by N/sub 2/, O/sub 2/, CO, CO/sub 2/, CH/sub 4/, H/sub 2/, and Ar

Journal Article · · J. Chem. Phys.; (United States)
OSTI ID:6547906

We have determined quenching rate coefficients for N/sub 2/(a /sup 1/Pi/sub g/, v' = 0) by N/sub 2/, O/sub 2/, H/sub 2/, CO/sub 2/, Ar, CH/sub 4/, and CO using two-photon laser excitation. Quenching by N/sub 2/ appears to proceed via collisional coupling to N/sub 2/(a' /sup 1/..sigma../sup -//sub u/, v = 0) with a rate coefficient of 2.2 +- 0.2 x 10/sup -11/ cm/sup 3/ molecule/sup -1/ s/sup -1/. Quenching by Ar is nearly as efficient. Gas-kinetic rate coefficients are obtained for quenching by CO, O/sub 2/, H/sub 2/, CO/sub 2/, and CH/sub 4/. Collisional energy transfer from N/sub 2/(a,0) to CO(A) is observed in these experiments. However, quenching by O/sub 2/, H/sub 2/, CO/sub 2/, and CH/sub 4/ is thought to be reactive.

Research Organization:
Physical Sciences, Inc., Research Park, P.O. Box 3100, Andover, Massachusetts 01810
OSTI ID:
6547906
Journal Information:
J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 90:4; ISSN JCPSA
Country of Publication:
United States
Language:
English