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Proceedings Paper

Vibration-Rotation Line Strengths Of The Gas-Phase Oh Radical
Author(s): James Podolske
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Paper Abstract

Absorption line strengths have been measured at 295 K for the first time for four vibration-rotation transitions of the OH radical, using a tunable, infrared diode-laser in conjunction with a molecular modulation spectrometer. A periodically varying OH concentration was created by photolysis, using a sinusoidally modulated 25374_ Hg lamp, of a flowing mixture of 03 and H2O contained within a quartz-walled White cell. The modulated absorption owing to the OH radical was subsequently observed by phase-sensitive detection. The absolute modulation amplitude of the OH number density was obtained by numerical simulation of the complete time-dependent photochemical system. The strongest transition measured was at 3407.607 cm-1, with a strength of 3.3 ±1.5 x 10-20 cm-1 molecule-1 cm2.

Paper Details

Date Published: 26 November 1983
PDF: 4 pages
Proc. SPIE 0438, Tunable Diode Laser Development and Spectroscopy Applications, (26 November 1983); doi: 10.1117/12.937463
Show Author Affiliations
James Podolske, NASA Ames Research Center (United States)


Published in SPIE Proceedings Vol. 0438:
Tunable Diode Laser Development and Spectroscopy Applications
Chiwoei Wayne Lo, Editor(s)

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