Calculation of coefficients of collisional broadening of ozone spectral lines induced by pressure of atmospheric gases

Abstract

Coefficients of the broadening of ozone lines by nitrogen and oxygen pressure in the ν1 + ν3 band at room temperature have been calculated. Calculations were performed by two methods. The first method is a modification of the semiclassical Robert-Bonamy formalism, in which parabolic trajectories are replaced by exact trajectories. This method enables one to describe the available experimental data with an accuracy of a few percents. The second, semiempirical, method is based on a two-parameter modification of the semiclassical impact model; it gives a high-accuracy global description of line profile parameters and, keeping the main physical regularities of pressure line broadening and shifting, enables a detailed study of these regularities and their dependence on environmental parameters. In contrast to the water vapor molecule, the broadening of spectral lines of the ozone molecule depends strongly on the rotational quantum numbers, so that the fitting parameters of the semiempirical method were determined separately for low, middle, and high values of the rotational quantum number J.