Figure 1. Transmittances recorded in the ν1/2ν2 Fermi dyad region at 300 K. (a) Pure CO2 gas. Increasing gas pressure induces, simultaneously, a rise of the collision-induced absorption and a transformation of the dimeric bands. The gas pressures are converted into densities in amagat (Table II of Ref. 11).
(b) 14.9-amagat CO2 mixed with various quantities of Ar. The absorption induced by collisions of CO2 monomers with Ar atoms has only a small influence on the band shape evolution which is dominated by the dimer signatures.