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ABSOLUTE INFRARED ABSORPTION INTENSITIES FOR OH $X^{2}\Pi (v:l.O)$
Aram Schiffman, David D. Nelson, David J. Nesbitt
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Abstract
The OH radical is of keen interest in many processes, including combustion, participation in atmospheric chemistry, and contribution to the infrared night glow. knowledge of infrared transition moments allows the possibility of determining stratospheric OH concentrations from the strong $``Metne^{1}$ bands'' emitted by OH. We have measured integrated line strengths for rotational lines in OH $X {^{2}}\\Pi (v:1.O)$ via infrared laser light absorption. The OH radicals were produced by photolysis of $HNO_{3}$ with a $193 \\mu m$ excimer laser; the transient species were probed with a single frequency, continuously tunable, stabilized color center laser. The absorption, were monitored as functions of time to determine peak cross sections, and of frequency to obtain the Integrated Lnestrengths.