Q-BRANCH SHAPES OF CO2 SPECTRUM IN 15 MU-M REGION - EXPERIMENT

The shapes of Q-branches in CO2 spectra in the 580-850 cm(-1) region f or pure gas and mixtures CO2-He and CO2-Ar have been studied at resolu tions up to 0.002 cm(-1). The branch broadening coefficients were meas ured in the pressure range from a few torr to 50 atm. Those for 11(1)0 2-02(2)01 Pi-Delta transition are different for pressures below and ab ove 5 atm. At higher pressures the branch broadening coefficients are similar for all Q-branches. The observed Q-branch shape transformation is explained by line mixing effects.