Effective collision strengths for transitions in singly ionized nitrogen

Details Effective collision strengths for transitions in singly ionized nitrogen Effective collision strengths for transitions in singly ionized nitrogen

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004mnras.348.1275h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 348, Issue 4, pp. 1275-1281.

Astronomy and Astrophysics

Astronomy

8

Atomic Processes, Line: Formation, Methods: Analytical

Scientific paper

The R-matrix method has been used to calculate effective collision strengths for the electron-impact excitation of the carbon-like ion N II. The lowest 23 LS target states are included in the expansion of the total wavefunction, consisting of the nine n= 2 states with configurations 2s22p2 and 2s2p3, along with 14 n= 3 states with configuration 2s22p3l (l= s,p,d). The fine-structure collision strengths have been obtained by transforming to a jj-coupling scheme using Saraph's JAJOM program, and have been determined at a sufficiently fine energy mesh to delineate properly the resonance structure. Effective collision strengths are obtained by averaging the electron collision strengths over a Maxwellian distribution of velocities. Results are presented for transitions among the 2s22p23P, 1D, 1S and 2s2p35S levels for electron temperatures in the range logTe(K) = 2.0-5.1, appropriate for astrophysical applications.

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