Oscillator strengths and collision strengths for S II

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Atomic Collisions, Atomic Excitations, Atomic Spectra, Io, Oscillator Strengths, Space Plasmas, Sulfur, Transition Probabilities, Atomic Energy Levels, Configuration Interaction, Electron Impact, Electron Orbitals, Hartree Approximation, Plasma Spectra, Ultraviolet Spectra, Wave Functions

Scientific paper

Calculations are presented of the collision strengths for electron impact excitation of S II from the ground 3s(2)3p(3)(4)S0 state to excited states 3s3p(4)(4)p, 3s(2(3p(2)4s(4)P, and 3s(2)3p(2)3d(4)P. The collision strengths are calculated in a close-coupling approximate ion for the energy range up to 10 to the 6th K. In addition, oscillator strengths are given for these transitions, as well as for some UV lines which have lower states 3s(2)3p(3)(2)D(O) and 3s(2)3p(3)(2)P(0). The calculation of the collision strengths involves the use of configuration interaction target wave functions which give oscillator strengths accurate to 30 percent in most cases.

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