Analytical FITS for electron collisionally excited effective collision strengths of O II

Astronomy and Astrophysics – Astrophysics

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Atom Concentration, Atomic Excitations, Electron Energy, Electron Scattering, Mathematical Models, Stellar Composition, Chebyshev Approximation, Forbidden Transitions, Ionization Potentials, Temperature Distribution

Scientific paper

Accurate effective collision strengths have recently been calculated in LS coupling for electron excitation of singly ionized atomic oxygen using an eleven-state R-matrix approximation. These data are fitted to interpolation formulae which are valid for the range of temperatures 5000 to 1,000,000 kelvins. Interpolated values may readily be obtained using a Numerical Algorithm Group (NAG) library routine or by an easily coded algorithm.

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