Electron collision strengths for the far-infrared lines of O III

Astronomy and Astrophysics – Astronomy

Scientific paper

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Electron Scattering, Far Infrared Radiation, Line Spectra, Milky Way Galaxy, Oxygen Spectra, Spectral Energy Distribution, Electron Energy, Fine Structure, Galactic Radiation, Interstellar Space

Scientific paper

New collision strengths have been obtained for electron impact excitation of the 3P(J)-to-3P(J-prime) fine structure transitions within the ground configuration of O(2+), by using a suitable transformation of LS-coupling reluctance matrix elements computed with the R-matrix method. These results exhibit a complex resonance pattern, and are given graphically for electron energies below 7.36 eV. Thermally averaged collision strengths, from which rate coefficients can be easily determined, are evaluated and tabulated as functions of electron temperature in the zero-20,000 K range.

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