Cavity Ring-Down Spectroscopy of O2–O2 Collisional Induced Absorption

Abstract

Abstract. Absolute cross sections (peak and band-integrated) for collision-induced absorption features in oxygen at 630, 577 and 477 nm are determined using the laser-based technique of cavity ring-down spectroscopy. A wavelength-dependent background, Rayleigh scattering extinction and oxygen-monomer absorption are unraveled from the collision-induced features and its quadratic pressure dependence is demonstrated for sub-atmospheric pressures