Study of the HD16O absorption in the 14,800–15,500 cm−1 range using LED-based Fourier transform spectroscopy

The spectrum of HD16O vapor has been recorded between 14,800 and 15,500 cm-1 by a Fourier transform spectrometer with a spectral resolution of 0.05 cm-1 using a high luminance LED light source and a 60-cm multipath cell with a path length of 3480 cm. A high signal-to-noise ratio (S/N ≈ 10,000) has allowed us to record the lines with intensities of 1.0 × 10-24 to 1.0 × 10-27 cm/molecule. More than 740 lines have been recorded in the spectrum of natural abundance water vapor and over 1210 lines in the spectrum of the vapor enriched with D. 316 rotation-vibration energy levels of the HD16O molecule have been assigned to nine vibrational states. The majority of these energies was attributed to the (014), (600), (142) and (302) states. One hundred two energy levels have been obtained for the first time. The recorded spectra have been compared with the simulations based on the HITRAN-2016 database and variational lists