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Intensity and pressure dependence of resonance fluorescence of OH induced by a tunable UV laserThe intensity and pressure dependence of the fluorescence spectrum of OH in the presence of N2 and H2O molecules was studied. Saturation of the absorption transition was observed at low pressures, and the corresponding fluorescence signal was found to vary as the square root of the exciting intensity. This observed dependence agreed with the predicted dependence which took into account the presence of laser modes in the spectrum of the exciting radiation. With full laser power incident, a saturation parameter as high as 3 x 10 to the 5th was observed. The fluorescence spectrum was found to peak at 3145 and at 3090 A, with the relative peak intensities dependent upon gas pressures and upon the particular rotational electronic transition used for excitation. It is concluded that vibrational relaxation of the electronically excited OH due to water vapor in the system plays a dominant role in determining the observed fluorescence spectrum.
Document ID
19760051624
Document Type
Reprint (Version printed in journal)
Authors
Killinger, D. K. (Ford Motor Co. Dearborn, MI, United States)
Wang, C. C. (Ford Motor Co. Dearborn, MI, United States)
Hanabusa, M. (Ford Motor Co. Dearborn, Mich., United States)
Date Acquired
August 8, 2013
Publication Date
June 1, 1976
Publication Information
Publication: Physical Review A - General Physics
Subject Category
LASERS AND MASERS
Funding Number(s)
CONTRACT_GRANT: NAS2-8798
Distribution Limits
Public
Copyright
Other