Diode-laser measurements of absorption by CO2-N2 mixtures in the trough between the R66 and R68 lines of the 12C16O2 v3-band are presented. Experiments have been performed in the 1.0–7.0 atm pressure range at temperatures of 296 and 370 K. The measured absorption is very different from that predicted by the addition of Lorentzian contributions. Theoretical calculations accounting for line-overlapping based on a fitting law are presented. Although the effects of line-overlapping are slightly underestimated, the agreement between experiments and calculations is quite good, for both the pressure and temperature dependences.
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