Abstract
Cross sections for absorption from excited vibrational levels of the ground X 3Σ - g state of molecular oxygen to the repulsive 1 3Π u state are given. The potential energy curve for the 1 3Π u state of O 2 is constructed to be consistent with predissociation data for the B 3Σ - u state and with recent ab initio calculations. In the photon wavelength range of 200–320 nm the cross sections are smoothly oscillatory and in no case larger than 1 × 10 -21 cm 2. In the region of the Schumann-Runge bands the cross sections are of order 0.4 × 10 -21 cm 2.
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