Fourier transform measurements of H218O and HD18O in the spectral range 1000-2300 cm−1

The spectra of water vapor enriched by 18O were recorded in the 1000-2300 cm−1 spectral range, which corresponds to the spectral region studied by IASI instrument (Infrared Atmospheric Sounding Spectrometer) instrument. The spectra were recorded by a step by step Fourier Transform Spectrometer (FTS) at room temperature with absorption path lengths up to 36 m. Positions, intensities and self broadening coefficients of about 1800 lines of H218O and 900 of HD18O were analyzed and all the transitions were assigned. This paper focuses on lines intensities and comparisons with data from literature are presented. An average difference of 10% with HITRAN2008 database H218O line intensities is found with a maximum discrepancy of about 25% for the ν1-ν2 band.

► We measured H218O and HD18O line positions and intensities between 4,3 and 10 μm. ► We investigate ∼1800 H218O and ∼900 HD18O transitions using FTS spectra. ► We compared our results with existing spectroscopic databases and literature data. ► Improved parameters can be added to HITRAN2008 to support IASI observations.