Time-Resolved Emission Studies of Vibrationally Excited Hydroxyl Radicals: OH(X2π,v''=9)

Details Time-Resolved Emission Studies of Vibrationally Excited Hydroxyl Radicals: OH(X2π,v''=9) Time-Resolved Emission Studies of Vibrationally Excited Hydroxyl Radicals: OH(X2π,v''=9)

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....8711145g&link_type=abstract

Journal of Geophysical Research, Volume 87, Issue C13, p. 11145-11152

Physics

24

Scientific paper

Vibrationally excited hydroxyl radicals OH(v''=9) are produced following the laser photolysis of O3/H2/He mixtures at 248 nm. The temporal profile of OH(v''=9) density was monitored by observation of the Δv=6 emission near 625 nm. Variation of the ozone pressure yields an estimate of the rate of vibrational relaxation of OH(v''=9) by O3, k~2×10-10 cm3 molecule s-1. Comparison of the observed overtone emission intensity with that arising from the O(21D2) precursor at 630 nm yields a factor-of-two estimate of the Einstein coefficient for spontaneous emission. A9->3~0.006 s-1. This is in agreement with a previous experimental study, but does not support a theoretical value that has been extensively utilized in modeling of atmospheric Meinel emission intensity.

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