Abstract
The infrared frequencies of 26 transitions in the ν2 bands of 14NH3 and 15NH3 have been measured by a combination of saturation spectroscopy and heterodyne techniques. The measurements are accurate to 0.5 MHz (~10−5 cm−1) and provide secondary calibration standards in the 9–13-μm region. Newly developed cw NH3 lasers are used to perform the majority of the measurements.
© 1985 Optical Society of America
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