Open AccessElectron impact excitation of S‐like iron
Author(s) -
Aggarwal Kanti M.,
Keenan Francis P.
Publication year - 2003
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.1365-8711.2003.06063.x
Subject(s) - physics , radiative transfer , excitation , atomic physics , dirac (video compression format) , r matrix , collision , electron , range (aeronautics) , electron ionization , ion , nuclear physics , quantum mechanics , materials science , computer security , computer science , neutrino , ionization , composite material
Energy levels and radiative rates for transitions among the lowest 48 fine‐structure levels belonging to the (1s 2 2s 2 2p 6 ) 3s 2 3p 4 , 3s3p 5 , 3s 2 3p 3 3d and 3p 6 configurations of Fe xi have been calculated using the fully relativistic grasp code. Additionally, collision strengths for transitions among these levels have also been computed using the Dirac Atomic R ‐matrix Code ( darc ) of Norrington & Grant. Radiative rates and oscillator strengths are tabulated for all allowed transitions among the 48 fine‐structure levels, while collision strengths are reported at three energies above thresholds, i.e. 8, 16 and 24 Ryd for a few representative transitions. Furthermore, excitation rates have been calculated in a wide electron temperature range below 5 × 10 6 K , and the contribution of resonances has been included in the threshold regions. Comparisons are made with the earlier available theoretical and experimental rates, and it is concluded that the experimental rates are overestimated by up to a factor of 2.