An approximate data base of H 2O infrared lines for high temperature applications at low resolution. Statistical narrow-band model parameters

Abstract

An approximate spectroscopic H 2O data base suitable for high temperature and a few tens cm -1 spectral resolution applications has been developed as an extrapolation of HITRAN92 and Flaud and Camy-Peyret bases for the spectral and temperature ranges 150–9000 cm -1 and 300–2500 K, respectively. The energies of high rovibrational levels have been extrapolated by using analytical expressions derived from Tyuterev's Hamiltonian. The intensities of lines issued from the fundamental vibrational level and from high rotational levels have been extrapolated empirically. The intensities of lines issued from other vibrational levels are calculated from the intensities of the corresponding lines issued from the fundamental vibrational level by using the independent rigid harmonic oscillator approach. Satisfactory agreement between line-by-line calculations based on the extended data base and experimental data is obtained. Statistical narrow-band model parameters have been adjusted using line-by-line calculations; they are available under request.