D2O absorption spectrum in the region near 0.95 μm: the ν1 + 3ν3 rotational-vibrational band

Abstract

The D₂О absorption spectrum was recorded between 10000 and 11400 cm^–1 by a Fourier transform spectrometer with a spectral resolution of 0.05 cm^–1. A multipass White-type cell with an optical path length of 24 m was used for the spectrum measurements. A light-emitting diode served as a radiation source, because it provides a higher brightness as compared to other emitters. A signal-to-noise ratio of 10⁴ was gained for the strongest lines. During the D₂О spectrum treatment, the experimental line list of about 100 lines of the ν₁ + 3ν₃ band was created. Spectroscopic parameters (line positions, intensities, and half widths) were calculated from fitting the experimental data to the Voigt line profiles by the least squares method. The analysis of the spectrum allowed us to derive new energy levels belonging to the vibrational state (103) of D₂¹⁶О.