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Atmospheric and Oceanic Optics

2022 year, number 11

Study of the methane spectrum near 1653 nm in the 298-720 К temperature range with a diode laser

D.M. Plastinina1,2, E.N. Chesnokov1
1V.V. Voevodsky Institute of Chemical Kinetics and Combustion of the Siberian Branch of the RAS, Novosibirsk, Russia
2National Research Novosibirsk State University, Novosibirsk, Russia
Keywords: methane spectrum, collisional broadening, diode laser, Fabry-Perot interferometer

Abstract

The methane spectrum is studied near R (3) and R (4) multiplets of the first vibrational overtone in the 298-720 K temperature range with a tuning diode laser. We have developed the technique for laser radiation measurement and frequency calibration with the use of a high-stability plain-mirror interferometer. The coefficients of collisional broadening by nitrogen are calculated at different temperatures.