Kinetic study on the photoabsorption process of gaseous O2 dimol at 630Â nm in a wide pressure range

An analytical 'quasi-equilibrium' model on O2 dimol is presented. The experimental data are well reproduced by the model using the absorption cross-section of (5.6 ± 1.1) × 10−24 cm2 molecule−1 at 630 nm and the dissociation equilibrium constant of (6.8 ± 1.4) × 1021 molecules cm−3.