Vibration-rotation line strengths of the gas-phase OH radicalAbsorption 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 2537-A Hg lamp, of a flowing mixture of O3 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 kaysers, with a strength of 3.3 + or - 1.5 x 10 to the -20th per(cm molecule) sq cm.
Document ID
19840060528
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Podolske, J. (NASA Ames Research Center Space Science Div., Moffett Field, CA, United States)