Collision-induced absorption between O-CO for the aΔ (v = 1) ← XΣ (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.

Publisher Correction: O-O and O-N collision-induced absorption mechanisms unravelled.

In the version of this Article originally published, Figures 3 and 4 were erroneously swapped, this has been corrected in all versions of the Article.

O-O and O-N collision-induced absorption mechanisms unravelled.

Collision-induced absorption is the phenomenon in which interactions between colliding molecules lead to absorption of light, even for transitions that are forbidden for the isolated molecules. Collision-induced absorption contributes to the atmospheric heat balance and is important for the electronic excitations of O that are used for remote sensing. Here, we present a theoretical study of five vibronic transitions in O-O and O-N, using analytical models and numerical quantum scattering calculations.