High-resolution rotational absorption spectra of H_2^16O, HD^16O, and D_2^16O between 110 and 500 cm^−1

Pure rotational spectra of 16O isotopic species of H2O, HDO, and D2O were measured with a high-resolution Fourier-transform spectrometer in order to obtain better calibration line positions for high-resolution spectroscopy. The number of assigned lines for HDO was ~380 and for H2O it was ~310 between 170 and 500 cm−1. For D2O, ~220 lines in the 110–420-cm−1 region were assigned. The calibration was performed with the highly accurate ν2 band of carbonyl sulfide.