Diode-laser measurements and calculations of CO₂-line-broadening by H₂O from 416 to 805 K and by N₂ from 296 to 803 K

Diode-laser measurements of H₂O-broadened ¹²C¹⁶O₂ line-widths at high temperature are presented. The T^-N dependences of the line-widths are deduced from experiments in the 416-805 K range for the R42 and R54 v₃-band lines broadened by H₂O. The temperature exponents N(CO₂-H₂O) take the values 0.79 ± 0.2 and 0.75 ± 0.2 for the R42 and R54 lines, respectively; the corresponding half-widths at 296 K are 0.146 and 0.144 cm^-1-atm^-1. Half-widths and strengths of the R66 and R68 v₃-band lines broadened by N₂ have also been measured in the 296-803 K range. The N(CO₂-N₂) values are 0.66 ± 0.08 and 0.67 ± 0.07 for the R66 and R68 lines, respectively, and the corresponding half-widths are 65.2 and 64.2 × 10^-3 cm^-1-atm^-1 at 296 K. Calculations for CO₂ line-broadening by H₂O and N₂ with the model proposed by Robert and Bonamy give satisfactory results.