CALCULATIONS AND MEASUREMENTS OF N2O ABSORPTION AT HIGH-TEMPERATURE IN THE 4.5 MU-M REGION

An approximate N2O spectroscopic database suitable for high temperatur e and medium resolution applications has been created in the 4.5 mu m region. Intensities of N-14(2) O-16 hot bands have been extrapolated p ragmatically from the nu(3) band intensity and energies of vibrational levels have been computed by diagonalization of the effective Hamilto nian. The new parameters have been merged with the data available in t he HITRAN database and in the recent experimental work of Toth. The en tire list has then been used to generate individual line parameters. P ure N2O spectra have been recorded with a Fourier Transform spectromet er up to 900 K and with 1 cm(-1) resolution. A good agreement between these spectra and line-by-line calculations using the new database is obtained while the use of HITRAN greatly underestimates absorption at high temperature. (C) 1997 Elsevier Science Ltd.