N 2-, O 2- and air-broadened half-widths and line shifts for transitions in the ν3 band of methane in the 2726- to 3200-cm −1 spectral region

Abstract

Complex Robert–Bonamy calculations of the pressure-broadened half-width and the pressure-induced line shift are made for some 4000 transitions in the ν 3 band of methane with N 2, O 2, and air as the perturbing gases. This work focuses on A and F symmetry transitions in the spectral range 2726 to 3200 cm −1. More work is needed on the intermolecular potential before calculations can be made for the E-symmetry transitions. The calculations are made at 225 and 296 K in order to determine the temperature dependence of the half-width. The calculations are compared with measurements. These data are to support remote sensing of the Earth and Titan atmospheres.