D2О absorption spectrum in the region near 0.95 mm: the n1 + 3n3 rotational-vibrational band
V.I. Serdyukov, L.N. Sinitsa, T.V. Kruglova, E.R. Polovtseva, A.D. Bykov, A.P. Sherbakov
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
Keywords: Фурье-спектроскопия, спектры поглощения водяного пара, центры и интенсивности спектральных линий, молекула DО, Fourier transform spectroscopy, water vapor absorption spectra, line positions and intensities, DО molecule
Abstract
D2О absorption spectrum were recorded between 10000 and 11400 cm-1 by a Fourier transform spectrometer with a spectral resolution of 0.05 cm-1. A multipass White’s-type cell was used for spectrum measurements, the optical path length was 40 m. A light emitting diode, which provides more brightness in comparison with other radiation sources, was used as a radiation source. Signal to noise ratios of 104 was obtained. During the D2О spectrum treatment, the experimental line list contained about 100 lines of the n1 + 3n3 band was created. Spectroscopic parameters (line positions, intensities, and half widths) were obtained by fitting experimental data to the Voigt line profiles with using least squares method. The analysis of the spectrum allowed us to derive new energy levels belonging to rovibrational state (103).
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