Open AccessEffective collision strengths for ground‐state and 2s 2 2p–2s2p 2 fine‐structure transitions in C ii
Author(s) -
Wilson N. J.,
Bell K. L.
Publication year - 2002
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2002.05982.x
Subject(s) - physics , collision , excitation , atomic physics , electron , ground state , ion , collisional excitation , range (aeronautics) , electron capture , r matrix , nuclear physics , quantum mechanics , ionization , computer security , computer science , materials science , composite material
The ab initio R ‐matrix method is used to calculate effective collision strengths for electron‐impact excitation of the boron‐like ion C ii . We consider the fine‐structure forbidden 2 P o 1/2 – 2 P o 3/2 transition within the 2s 2 2p ground configuration as well as the 16 fine‐structure transitions arising from excitation from the 2s 2 2p to the 2s2p 2 configuration. The 16 lowest LS target states are included in the calculation. Effective collision strengths are obtained by averaging the electron collision strengths over a Maxwellian distribution of electron velocities. Results are presented for electron temperatures in the range log T ( K ) = 3.0–5.5 , appropriate for astrophysical applications. Good agreement with previous evaluations is obtained.