Abstract
We have calculated electron collisional excitation strengths for transitions among the 18 LS states 2s22p34So, 2Do, 2Po; 2s22p2(3P)3s4P, 2P; 2s2p44P; 2s22p2(3P)3p2So, 4Do, 4Po, 4So, 2Do, 2Po; 2s22p2(1D)3s2D; 2s22p2(3P)4s4P, 2P; and 2s22p2(3P)3d2P, 4P, 2D of N I using the R-matrix method. These states are represented by fairly extensive configuration-interaction wave functions. The 18 LS states give rise to 40 fine-structure levels. The calculated excitation energies agree well with the measured values. The collision strengths for fine-structure transitions are obtained using an algebraic transformation to intermediate coupling. The collision strengths are integrated over a Maxwellian distribution of electron energies to obtain effective collision strengths over a wide temperature range from 1000 to 600,000 K. The effective collision strengths obtained are tabulated for transitions among the lowest 12 LS states.
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