A model of the Schumann-Runge continuum of O2

Physics

Scientific paper

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Oxygen, Photodissociation, Polarization (Charge Separation), Schumann-Runge Bands, Absorption Cross Sections, Electron Transitions, Potential Energy, Ultraviolet Spectra

Scientific paper

Ab initio calculations of the B3Σu- potential energy curve of O2 are reported together with the transition moment connecting the B3Σu- 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 3Πu state and the auxiliary maxima to transitions into the B3Σu-state.

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