N2-, O2-, and air-broadened half-widths, their temperature dependence, and line shifts for the rotation band of H216O

Complex Robert-Bonamy (CRB) calculations of the half-width, its temperature dependence, and the line shift have been made for the rotation band transitions of (H2O)-O-16 for N-2 or O-2, as the bath molecule. First the atom-atom component of the intermolecular potential was adjusted to reproduce the half-widths of the 22 and 183 GHz transition determined by Payne et al. (IEEE Trans. Geosci. Remote Sensing 46 (2007) 3601-3617). Then the line shape parameters were determined at seven temperatures (200, 225, 275, 296, 350, 500, and 700 K) for the H2O-N-2 and H2O-O-2 Systems. The air-broadened values were determined at each temperature by the standard method. The half-widths, their temperature dependence, and the line shifts were studied as a function of the rotational quantum numbers. Estimating line shape parameters by scaling from one perturbing gas to another was investigated. The calculations were compared with measurement. (C) 2009 Elsevier Inc. All rights reserved.