High-resolution far-infrared (20–350-cm −1 ) spectra of several isotopic species of H 2 O

Far-infrared pure rotational spectra of H216O, H218O, HD16O, HD18O, D216O, and D218O have been measured with a high-resolution Fourier-transform spectrometer with an apparatus function of 0.004 cm−1 in the region from 20 to 350 cm−1. Altogether about 1200 lines have been assigned and measured with an accuracy that is believed to be ~0.0002 cm−1 (~6 MHz), so that many of the frequencies should be of use in the calibration of far-infrared spectrometers.

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