A model of the Schumann‐Runge continuum of O₂

Ab initio calculations of the B ³Σ u − potential energy curve of O 2 are reported together with the transition moment connecting the B ³Σ u − and the ground electronic states. Photodissociation cross sections are presented over the wavelength region 127–152 nm. Small adjustments to the potential energy curve and the transition moment lead to a model of the absorption which agrees well with the experimental cross sections and which reproduces the structural features observed on the high‐energy edge. The shoulder at 135.6 nm is attributed to the lowest ³Π u state and the auxiliary maxima to transitions into the B ³Σ u − state.