Universal functions for estimating total vibration-rotation band absorptance. III. Asymmetric tops.

The method of universal functions (MUF) for estimating total band absorptances and their derivatives, for nonoverlapping lines of vibration-rotation bands of linear molecules and spherical and symmetric tops, is extended to asymmetric top bands. The universal functions for symmetric tops are employed. The accuracy of MUF is within a few percent for the 010-000 and 001-000 bands of H₂O and O₃ and Lorentz line shapes at temperatures of 175 - 325K. A simple technique for obtaining an effective Lorentz width for all of the band lines is proposed for application to MUF.