A&A 430, 725-729 (2005)
Effective collision strengths for fine-structure transitions for the electron impact excitation of N IIC. E. Hudson and K. L. Bell
Department of Applied Mathematics and Theoretical Physics, The Queens University of Belfast, Belfast BT7 1NN, Northern Ireland, UK
(Received 7 September 2004 / Accepted 28 September 2004 )
We present effective collision strengths for the electron impact excitation of singly ionized nitrogen which have been calculated using the R-matrix method. The 23 lowest LS states are included in the expansion of the total wavefunction. These target states arise from the 2s 22p 2, 2s2p 3 and 2s 22p3 l( configurations, leading to 41 fine structure levels and 820 possible transitions. The fine-structure collision strengths were obtained by transforming to a jj-coupling scheme using the JAJOM program of Saraph and have been determined at a sufficiently fine energy mesh to delineate properly the resonance structure. The effective collision strengths were calculated by averaging the electron collision strengths over a Maxwellian distribution of velocities. Tabulations of the non-zero effective collision strengths are given for electron temperatures ( ) in the range .
Key words: atomic processes -- line: formation -- methods: analytical
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