A modified projection approach to line mixing

This paper presents a simple approach to combine the high-resolution narrowband features of some desired isolated line models together with far wing behavior projection based strong collision (SC) method mixing which was introduced by Bulanin, Dokuchaev, Tonkov and Filippov. The can be viewed in terms small diagonal perturbation SC relaxation matrix providing required accuracy close centers at same time as coupling transfer rates are retained optimally scaled thermalize radiator after impact. conveniently placed framework Boltzmann-Liouville transport equation where rigorous diagonalization problem requires that molecular phase velocity changes assumed uncorrelated. A detailed analysis for general Doppler case is given on first order Rosenkranz approximation, also provides possibility incorporate quadratically speed dependent parameters. Exact solutions pure pressure broadening explicit approximations independent parameters (line frequency, strength, width shift) readily retrieved from databases such HITRAN large number species. Numerical examples including comparisons published measured data provided two specific cases concerning absorption carbon dioxide its infrared band asymmetric stretching, well atmospheric water vapor oxygen relevant millimeter bands.