LINE MIXING IN THE Q-BRANCHES OF THE NU-1+NU-2 BAND OF NITROUS-OXIDE AND OF THE (1110)1-](0220) BAND OF CARBON-DIOXIDE

Line mixing effects have been observed in absorption spectra recorded, at room temperature, with a Fourier spectrometer. They concern the Q branches of the nu-1 + nu-2 band of N2O, centered at 1880.2 cm 1 and of the (11 (1)0) I <-- (02(2)0) band of CO2, centered at 740.8 cm-1. For the N2O spectra, the gas was pure and its pressure has been raised up to more than 6 atm. The CO2 spectra were registered with a total gas pressure below 1 atm and the gas was either pure or mixed with argon or nitrogen. Comparison is made between the experimental results and computations taking into account the off-diagonal elements of the relaxation matrix.