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| - Electron impact excitation collision strength for transitions in C II
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| - Aims. Oscillator strengths and electron impact excitation collision strengths for C II lines among the fine-structure levels are calculated. Thermally averaged collision strengths are presented as a function of electron temperature for application to astrophysical plasmas. Methods. An accurate description of the target wave functions has been obtained in the multiconfiguration Hartree-Fock approach with flexible non-orthogonal orbitals. The 42 fine-structure levels of the 2s 22p, 2s2p 2, 2s 23l ( $l = 0-2$), 2p 3, 2s 24l ( $l = 0$-3), 2s2p3s and $2s^25l$ ( $l = 0-2$) configurations have been included in the scattering calculation. A second calculation with lowest 35 levels in the close-coupling expansion has also been carried out to check channel coupling effects on collision strengths. The continuum functions have been represented by the use of B-spline basis. The B-spline R-matrix method in the framework of Breit-Pauli approximation has been used to investigate the electron impact excitation of forbidden and allowed transitions in C II. Results. The present cross sections for the resonance 2P°-2s2p $^2~^2$D, 2S and intercombination 2P°-2s2p 2 4P transitions are in very good agreement with the electron energy-loss merged-beams experiment. Oscillator strengths and transition probabilities for C II lines normally compare very well with previous calculation. The effective collision strengths are obtained by integrating total resonant and non-resonant collision strengths over a Maxwellian distribution of electron energies and these are presented over a wide temperature range suitable for modeling of astrophysical plasmas. Our effective collision strengths show significant differences with those from previous calculations for transitions involving higher excitation levels.
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