Experimental investigation of the parameters of the CO2 absorption spectral lines

Abstract

Carbon dioxide is the main component which absorbs radiation in the atmosphere of the earth, Mars, and Venus, and is also contained in the products of fuel combustion. For this reason there is considerable interest in the absorption characteristics at different temperatures, pressures, and CO= contents for uniform and nonuniform optical paths at high, medium, and low spectral resolutions. As a result of the introduction of high-speed computers, numerical integration of the fine structure of the absorption spectrum has become more and more widely used in calculations of the absorption of infrared radiation. Such calculations require data on the intensity, half-width, and positions of the absorption spectral lines and their contours. Unfortunately, the quantum-mechanics approach to calculating the parameters of the absorption spectral lines is not entirely satisfactory, and experimental data on the intensity, half-width, and positions of the spectral lines are required in order to normalize the spectroscopic constants.