The CO2 absorption was measured in the 7000 and 8000 cm–1 regions. The absorption coefficients were calculated using the asymptotic line wing shape theory. Line shape parameters were found from fitting to experimental data. The calculation results agree well with the measurement data. According to the line wing theory, the absorption in the band wings is caused by the wings of strong lines of an adjacent band. Within these assumptions, experimental and calculated data on the CO2 absorption coefficient in the band wings in the 7000 and 8000 cm–1 regions can provide information on the line shape at frequency detuning from several tens to several hundreds of half-widths. The results support the hypothesis that line shape parameters in the line wings related to transitions with the same initial state are close to each other. Deviations from a Lorentzian profile are found for some CO2 bands and turn out different for the wings of different bands
Atmospheric and Oceanic Optics is the English edition of the Russian monthly academic journal Optika Atmosfery i Okeana translated and published by the Institute of Atmospheric Optics.
The Atmospheric and Oceanic Optics presents experimental and theoretical articles relevant to a wide range of problems of atmospheric and ocean optics, ecology, and Earth's climate. The journal's coverage includes: - scattering and transfer of optical waves, - spectroscopy of atmospheric gases, - turbulent and nonlinear optical phenomena, - adaptive optics, - remote (ground-based, airborne, and spaceborne) sensing of the atmosphere and the surface, - methods for solution of inverse problems, - new equipment for optical investigations, - development of computer programs and databases for optical studies.
Specialized issues of the journal regularly present proceedings of regional and international scientific conferences and meetings, such as Siberian Aerosols and Atomic and Molecular Pulsed Lasers (AMPL). Various topical issues are devoted to studies of atmospheric ozone, adaptive, nonlinear, and coherent optics, regional climate-ecological monitoring, and other subjects.
English (Science - Nauka)
Line broadening coefficients of the CO2–Ar fundamental 3 band are obtained experimentally and theoretically for temperatures from 120 to 765 K. The experimental results are obtained by Fourier-transform infrared spectroscopy. Theoretical values are provided ia quantum-mechanical (close coupling and coupled states) approaches as well as semiclassical (improved Smith–Giraud–Cooper and Robert–Bonamy) methods. The most up-to-date CO2–Ar ab initio intermolecular potential (J. M. Hutson, A. Ernesti, M. M. Law, C. F. Roche and R. J. Wheatley, J. Chem. Phys., 1996, 105, 9130) is employed for all calculations. For all the temperatures probed, theoretical values are found to be in a rather good agreement with experiment. In addition, the Raman Q(j) line broadening coefficients and the application of the random phase approximation are presented.
