HDO and D2O Low Pressure, Long Path Spectra in the 600-3100 cm-1 Region.

High-resolution spectra of gas mixtures of HDO, D2O, and H2O were obtained with a Fourier-transform spectrometer with path lengths up to 433 m. The spectra were analyzed to obtain line positions and strengths of over 6000 transitions of HDO and D2O. For HDO, these included the (000)-(000), (020)-(010), and (100)-(010) bands of HD16O and the (010)-(000) bands of HD16O, HD17O, and HD18O. Several of these assignments are reported for the first time. Of interest was the extended coverage of the A-type transitions of the (010)-(000) band of HD16O. This is the only A-type infrared band of any of the water vapor species (HDO, D2O, and H2O) that is not involved in interactions with other bands. By this token, the A-type dipole-moment expansion matrix elements can be tested without involving perturbation theory. The measured linestrengths of the interacting bands, (020)-(010) and (100)-(010), were analyzed using a full perturbation treatment. Strong localized Coriolis interactions affected only a few observed transitions. Copyright 1999 Academic Press.