Collision-induced absorption between O-2-CO2 for the a(1)Delta(g) (v=1) <- X-3 Sigma(-)(g) (v=0) transition of molecular oxygen at 1060 nm

Collision-induced absorption between O2 and CO2 molecules associated with the a1Δg (v = 1) ← X3Σ−g (v = 0) band of oxygen around 1060 nm was measured using cavity ring-down spectroscopy. The lineshape for this transition is measured for the first time, and the integrated cross-section is found to be smaller than the only previous report. For pure oxygen, we find an integrated absorption value of (2.10 ± 0.31) × 10−4 cm−2 amg−2 which is in good agreement with the previous reported values. For O2–CO2 collisions we report an integrated value of (6.37 ± 1.09) × 10−5 cm−2 amg−2 which is small but still significant and not accounted for by theory.