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Precision measurements of NH3 spectral lines near 11 microns using the infrared heterodyne techniqueAbsolute 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.
Document ID
19770064791
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hillman, J. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kostiuk, T. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Buhl, D. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Faris, J. L. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Novaco, J. C. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Mumma, M. J. (NASA Goddard Space Flight Center Laboratory for Extraterrestrial Physics, Greenbelt, Md., United States)
Date Acquired
August 9, 2013
Publication Date
September 1, 1977
Publication Information
Publication: Optics Letters
Volume: 1
Subject Category
Lasers And Masers
Accession Number
77A47643
Distribution Limits
Public
Copyright
Other

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