Pure NH3 spectrum measurements and analysis of overlapping absorption lines in 6611.6-6613.5 cm-1 region
V.A. Kapitanov1, Ya.Ya. Ponurovskii2, K.Yu. Osipov1, Yu.N. Ponomarev1
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
2Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow, Russia
Keywords: diode laser spectroscopy, spectral line, lineshape, line parameters
Abstract
The results of experimental studies of absorption spectra of pure NH3 at room temperature in the ranges 6604.3-6606.3 and 6611.6-6613.5 cm-1 and pressure of up to 0.04 atm are presented. The measurements were carried out at the Department of Diode Laser Spectroscopy of the Institute of General Physics at a high-sensitivity high-resolution diode laser spectrometer with a signal-to-noise ratio of ~ 1400. The spectra were analyzed using a Voigt contour. The results of retrieving the parameters of spectral absorption lines are presented: the positions of centers, intensities, and coefficients of collisional self-broadening and shifts. A comparison was made with the parameters from HITRAN database. A two-fold difference between the measured intensities of a number of lines and the HITRAN values was found.
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