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High-resolution Fourier transform spectroscopy of the Meinel system of OH
Abrams, Mark C.; Davis, Sumner P.; Rao, M. L. P.; Engleman, Rolf, Jr.; Brault, James W.
AA(Jet Propulsion Laboratory, Pasadena, CA, US), AB(Jet Propulsion Laboratory, Pasadena, CA, US), AC(University of California at Berkeley, Berkeley, CA, US), AD(University of California at Berkeley, Berkeley, CA, US), AE(National Solar Observatory, Tucson, AZ)
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 93, no. 1, p. 351-395 (ApJS Homepage)
Publication Date:
Atomic and Molecular Physics
NASA/STI Keywords:
Hydroxyl Radicals, Infrared Spectra, Molecular Excitation, Molecular Spectra, Molecular Spectroscopy, Nightglow, Fourier Transformation, Line Spectra, Rotational States, Upper Atmosphere, Vibrational States
Bibliographic Code:


The infrared spectrum of the hydroxyl radical OH, between 1850 and 9000/cm has been measured with a Fourier transform spectrometer. The source, a hydrogen-ozone diffusion flame, was designed to study the excitation of rotation-vibration levels of the OH Meinel bands under conditions similar to those in the upper atmosphere which produce the nighttime OH airglow emission. Twenty-three bands were observed: nine bands in the Delta upsilon = 1 sequence, nine bands in the Delta upsilon = 2 sequence, and five bands in the Delta upsilon = 3 sequence. A global nonlinear least-squares fit of 1696 lines yielded molecular parameters with a standard deviation of 0.003/cm. Term values are computed, and transition frequencies in the Delta upsilon = 3, 4, 5, 6 sequences in the near-infrared are predicted.

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