Laboratory study of the O I /7990 A/ branching ratio

Physics

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Atmospheric Radiation, Atomic Excitations, Branching (Physics), Electron Transitions, Oxygen Spectra, Emission Spectra, Far Ultraviolet Radiation, Infrared Spectra, Oxygen Atoms

Scientific paper

Branching ratios for several atomic oxygen 3p 3D transitions have been studied. A value of 0.0004 + or - 20% for the O I (7990 A) branching ratio was obtained, which is much smaller than the previously accepted value and in accord with recent calculations and interpretations of the auroral extreme-ultraviolet spectra. Measurements of the O I (7002 A) and O I (11,287 A) multiplets give branching ratios of 0.05 and 0.10, which are in better accord with calculations. As part of this experiment, results of a study of the highly structured O2 photoabsorption cross section in the neighborhood of the multiplets are also reported.

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