Relativistic distorted-wave collision strengths for the 49 Δn=0Δn=0 optically allowed transitions with n=2n=2 in the 67 N-like ions with 26≤Z≤9226≤Z≤92

Relativistic distorted-wave collision strengths have been calculated for the 49 Δn=0Δn=0 optically allowed transitions with n=2n=2 in the 67 N-like ions with nuclear charge number ZZ in the range 26≤Z≤9226≤Z≤92. The calculations were made for the four final, or scattered, electron energies E′=0.20E′=0.20, 0.42, 0.80, and 1.40, where E′E′ is in units of Zeff2 Ry with Zeff=Z−5. In the present 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 the previous work by Zhang and Sampson [H.L. Zhang and D.H. Sampson, At. Data Nucl. Data Tables 72 (1999) 153]. In that earlier work, collision strengths were also provided for N-like ions, but for a more comprehensive data set consisting of all possible 105 Δn=0Δn=0 transitions, six scattered energies and the 81 ions with ZZ in the range 12≤Z≤9212≤Z≤92. The collision strengths covered in the present work should be more accurate than the corresponding data given by Zhang and Sampson [H.L. Zhang and D.H. Sampson, At. Data Nucl. Data Tables 72 (1999) 153] and are presented here to replace those earlier results.