Relativistic distorted-wave collision strengths and oscillator strengths for the [formula omitted] transitions with [formula omitted] in the 67 C-like ions with [formula omitted

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Abstract Relativistic distorted-wave collision strengths have been calculated for the 185 Δ n = 0 transitions with n = 2 in the 67 C-like ions with nuclear charge number Z in the range 26 ≤ Z ≤ 92 . The calculations were made for the six final, or scattered, electron energies E ′ = 0.03 , 0.08 , 0.20 , 0.42 , 0.80 , and 1.40 , where E ′ is in units of Z eff 2 Ry with Z eff = Z − 4.17 . In addition, electric dipole oscillator strengths are provided. In the present collision-strength calculations, an improved “top-up” method, which employs relativistic plane waves, was used to obtain the high partial-wave contribution for each transition, in contrast to the partial-relativistic Coulomb–Bethe approximation used in previous work by Zhang and Sampson [H.L. Zhang, D.H. Sampson, At. Data Nucl. Data Tables 63 (1996) 275]. In that earlier work, collision strengths were also provided for the same 185 Δ n = 0 transitions in C-like ions, but for the more limited list of 46 ions with Z in the range 9 ≤ Z ≤ 54 . The collision strengths covered in the present work, particularly those for optically allowed transitions, should be more accurate than the corresponding data given by Zhang and Sampson [H.L. Zhang, D.H. Sampson, At. Data Nucl. Data Tables 63 (1996) 275] and are presented here to replace those earlier results.