Self-broadening and self-shift coefficients of O2 absorption lines in 1.27 μm spectral region
T.M. Petrova, A.M. Solodov, A.A. Solodov, V.M. Deichuli
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: oxygen, Fourier spectrometer, absorption spectra, absorption line broadening and shift coefficients, carbon dioxide
Abstract
Molecular oxygen is an important gas both in the Earth's atmosphere and in the atmospheres of Mars and Venus. To determine its content the highly accurate absorption line parameter values are required. For this purpose, O2 absorption spectra were recorded in the 7800-7990 cm-1 range using a Bruker IFS 125HR Fourier spectrometer. The spectra were recorded at a spectral resolution of 0.01 cm-1, a room temperature, and an optical path length of 2880 cm for five values of oxygen pressure. The intensities, broadening and shift coefficients, and parameters characterizing the dependence of broadening on the velocity of colliding molecules were determined for 55 O2 absorption lines broadened by self pressure. A good agreement between our intensity values and high-precision measurements by other authors is shown. The self-shift coefficients are obtained for the first time.
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