Absorption spectrum of deuterated water vapor enriched by 18O between 6000 and 9200 cm−1

Abstract The absorption spectrum of water vapor enriched by deuterium and oxygen-18 is analyzed in the 6000–9200 cm −1 region. The spectrum has been recorded at room temperature with a Bruker IFS 120 h Fourier transform spectrometer. More than 14,000 absorption lines were measured in the recorded spectrum. The vibration–rotation assignments were performed on the basis of previously published experimental energies and of variational calculations. Nine water species (H 2 16 O, HD 16 O, D 2 16 O, H 2 18 O, HD 18 O, D 2 18 O, H 2 17 O, HD 17 O and D 2 17 O) were found to contribute to the observed absorption. More than 3600 lines of 19 vibrational bands of D 2 18 O and about 4700 lines of 16 bands of HD 18 O with J as high as 19 and K a as high as 11 were assigned. The main part of the HD 18 O and D 2 18 O lines and all lines of HD 17 O and D 2 17 O were observed in the laboratory for the first time. The obtained vibration–rotation energy levels are compared with previous experimental studies and the results of variational calculations.