Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...307..410b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 307, Aug. 1, 1986, p. 410-413. Research supported by the Chemical Manufactu
Astronomy and Astrophysics
Astrophysics
15
Far Infrared Radiation, Hydroxyl Radicals, Infrared Spectra, Laser Spectroscopy, Rotational Spectra, Carbon Dioxide Lasers, Electron Transitions, Extrapolation, Molecular Energy Levels, Tunable Lasers
Scientific paper
Rotational and fine-structure transitions between the low rotational levels of the OH radical in its X 2Pi state have been observed in absorption in the laboratory. It has thus been possible to measure the frequencies of these transitions directly. The observations were made with tunable far-infrared radiation generated by mixing two chosen CO2 laser frequencies in a metal-insulator-metal diode; the far-infrared difference frequency was radiated from the diode's whisker antenna. The measurements have an accuracy of a few hundred kHz. They both confirm and improve on the best previous estimates, which were obtained by extrapolation of laser magnetic resonance data.
Brown Jonathan M.
Evenson Kenneth M.
Hinz A.
Jennings D. A.
Zink Lyndon R.
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