Continuum absorption of vibrationally excited O2 from 200-320 nm

Physics

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Absorption Cross Sections, Ground State, Molecular Excitation, Molecular Gases, Oxygen, Photolysis, Upper Atmosphere, Vibrational States, Atmospheric Chemistry, Quantum Mechanics, Schumann-Runge Bands, Spectrum Analysis

Scientific paper

Cross sections for absorption from excited vibrational levels of the ground X(sup 3)sigma(sup - sub g) state of molecular oxygen to the repulsive 1(sup 3)pi(sub u) state are given. The potential energy curve for the 1(sup 3)pi(sub u) state of O2 is constructed to be consistent with predissociation data for the B(sup 3)sigma(sup - sub 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 x 10(exp -21)/sq cm. In the region of the Schumann-Runge bands the cross sections are of order 0.4 x 10(exp -21)/sq cm.

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