TITLE

Temperature- and species-dependent quenching of CO B probed by two-photon laser-induced fluorescence using a picosecond laser

AUTHOR(S)
Settersten, T. B.; Dreizler, A.; Farrow, R. L.
PUB. DATE
August 2002
SOURCE
Journal of Chemical Physics;8/15/2002, Vol. 117 Issue 7, p3173
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report measurements of the temperature- and species-dependent cross sections for the quenching of fluorescence from the B 1Σ[sup +](υ = 0) state of CO. Cross sections were measured for gas temperatures ranging from 293 K to 1031 K for quenching by H[sub 2], N[sub 2], O[sub 2], CO, H[sub 2]O, CO[sub 2], CH[sub 4], He, Ne, Ar, Kr, and Xe. The CO B 1Σ[sup +](υ = 0) state was populated via two-photon excitation (B ¹Σ[sup +] ←← X ¹Σ[sup +]), and the B ¹Σ[sup +] → A ¹A¹Π fluorescence was collected. Quenching cross sections were determined from the dependence of the fluorescence-decay rate on quencher-gas pressure. The temperature dependence of the cross sections is well described by a power law for all but the two weakest quenchers, He and Ne.
ACCESSION #
7083579

 

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