2ν_2–ν_2 and 2ν_2 bands of H_2^16O, H_2^17O, and H_2^18O: line positions and strengths

Abstract

High-resolution spectra of H₂¹⁶O, H₂¹⁷O, and H₂¹⁸O were recorded with a Fourier-transform spectrometer, covering transitions in the (020)–(010) and (020)–(000) bands. The measured line frequencies were used to determine high-accuracy values of rotational energy levels in the (020) vibrational states for the three isotopic species. Measurements of the line strengths were fitted to a model in which 19 transition moment parameters were determined for each band and molecule. The fitting technique did not consider interactions between the (020), (100), and (001) vibrational states. The experimental results provide a more accurate representation of the line positions and strengths than those currently available for these bands.