Direct measurement of the fundamental rotational transitions of the OH radical by laser sideband spectroscopy

Creators: Farhoomand, Jam; Blake, Geoffrey A.; Pickett, Herbert M.

Abstract

We report for the first time the direct (zero-field) spectra of the fundamental rotational transitions of the OH radical in its Ω = 3/2 and 1/2 states at 2509.9 and 1834.7 GHz using a recently developed far-infrared laser sideband spectrometer. These measurements have verified and refined the predictions of previous laser magnetic resonance (LMR) work, thereby confirming the far-infrared detection of interstellar OH. The increased accuracy of these direct measurements will be useful to future astronomical and atmospheric studies of these important transitions.

Additional Information

© 1985 American Astronomical Society. Provided by the NASA Astrophysics Data System. Received 1984 November 30; accepted 1985 January 8. We would like to thank Dr. K. M. Evenson of the National Bureau of Standards, Boulder, for providing his measured CO frequencies prior to publication, and Dr. E. A Cohen for useful discussions during the course of this work. We would also like to thank M. Schaefer for his assistance on the Schottky diode mixer. The research described in this paper was performed by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.

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