INFRARED DIODE LASER HETERODYNE MEASUREMENTS ON $^{14}NH_{3}$
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Date
1981
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Ohio State University
Abstract
The frequencies of 32 obsorption lines of $^{14}NH_{3}$ in the 9 and 10 micrometer region were measured by use of a diode laser heterodyne spectrometer. The frequencies of 11 additional IR transitions were determined from these measured transitions by forming combination differences with measured inversion and rotation-inversion transitions [1]. The precision of our measurement was about 3 MHz or $1 \times 10^{-4} \mbox{cm}^{-1}$. When referred to previous measurements by other ultra-high resolution techniques on 12 lines that have been reported accurate to $2 \times 10^{-4} \mbox{cm}^{-1}$ or better, our corresponding measurements have a standard deviation of $1.1 \times 10^{-4} \mbox{cm}^{-1}$. After an allowance for systematic errors, we believe our measurements to be accurate to 6 MHz. When referred to our new measurements, the standard deviation of the frequencies of 19 transitions previously measured by etalon calibration is $6 \times 10^{-3} \mbox{cm}^{-1}$.
Description
$^{1}$S. Urban et al., J. Mol. Spectrosc. 79, 455--495 (1980).
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