DIODE-LASER MEASUREMENTS OF HE-BROADENING AND N-2-BROADENING COEFFICIENTS AND LINE-MIXING EFFECTS IN THE Q-BRANCH OF THE NU(1)-NU(2) BAND OF CO2

He- and N-2-broadening coefficients have been measured for the lines Q 2 to Q22 of the v(1)-v(2) (10(0)01 <-- 01(1)01) band of CO2 near 720.8 0 cm(-1), using a tunable diode-laser spectrometer. The collisional wi dths have been obtained at low perturber pressures by fitting Voigt an d Galatry profiles to the measured shapes of the lines. Spectra in the v(1)-v(2) band of CO2 in mixture with He and N-2 have also been recor ded at higher pressures. The deviations observed from an additive supe rposition of Lorentzian lines have been notably reduced by considering collision-induced line-mixing effects. (C) 1998 Elsevier Science Ltd. All rights reserved.