J. J. Hillman, Theodor Kostiuk, David Buhl, J. L. Faris, J. C. Novaco, and M. J. Mumma, "Precision measurements of NH3 spectral lines near 11 μm using the infrared heterodyne technique," Opt. Lett. 1, 81-83 (1977)
Absolute line-center frequencies for eleven lines of ammonia in near coincidence with CO2-laser transitions have been determined to accuracies of ±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-μm wavelength region.
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Prefix 2 is for the 2ν2 − ν2 overtone band. All other lines are in the ν2 fundamental.
Taken from Ref. 6.
Taken from Ref. 7.
Taken from Ref. 5.
For the 12C16O2 isotope: F. R. Peterson, D. G. McDonald, J. D. Cupp, and B. L. Danielson, “Accurate rotational constants, frequencies, and wavelengths from 12C16O2 lasers stabilized by saturated absorption,” in Laser Spectroscopy, R. G. Brewer and A. Mooradian, eds. (Plenum, New York, 1974), pp. 555–569.
For the 13C16O2 isotope: C. Freed, D. L. Spears, R. G. O’Donnell, and A. H. M. Ross, “Precision heterodyne calibration,” in Laser Spectroscopy, pp. 171–191.
Prefix 2 is for the 2ν2 − ν2 overtone band. All other lines are in the ν2 fundamental.
Taken from Ref. 6.
Taken from Ref. 7.
Taken from Ref. 5.
For the 12C16O2 isotope: F. R. Peterson, D. G. McDonald, J. D. Cupp, and B. L. Danielson, “Accurate rotational constants, frequencies, and wavelengths from 12C16O2 lasers stabilized by saturated absorption,” in Laser Spectroscopy, R. G. Brewer and A. Mooradian, eds. (Plenum, New York, 1974), pp. 555–569.
For the 13C16O2 isotope: C. Freed, D. L. Spears, R. G. O’Donnell, and A. H. M. Ross, “Precision heterodyne calibration,” in Laser Spectroscopy, pp. 171–191.
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