Physics – Optics
Scientific paper
Sep 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977optl....1...81h&link_type=abstract
Optics Letters, vol. 1, Sept. 1977, p. 81-83.
Physics
Optics
12
Ammonia, Carbon Dioxide Lasers, Heterodyning, Infrared Spectroscopy, Molecular Spectroscopy, Absorption Spectra, Error Analysis, Frequency Standards, Line Spectra, Spectral Resolution
Scientific paper
Absolute line-center frequencies for eleven lines of ammonia in near coincidence with CO2-laser transitions have been determined to accuracies of + or -3 MHz by infrared heterodyne detection. These results were obtained by heterodyning a blackbody with a stable grating-tuned CO2 gas laser. A discussion of the apparatus and method of calculation, including error analysis, is presented. With these accurately determined line-center positions, the ammonia molecule will be a useful secondary-frequency standard for diode-laser spectroscopy in the 11-micron wavelength region.
Buhl David
Faris J. L.
Hillman John J.
Kostiuk Theodor,
Mumma Michael J.
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