Cross Sections and Rate Coefficients for Excitation of Δ n = 0 Transitions in Be-Like Ions with 6 ≤ Z ≤ 54

Abstract

Excitation cross sections and rate coefficients by electron impact are calculated for the transitions among the 1 s 22 s 2, 1 s 22 s2 p, 1 s 22 p 2 levels of the Be-like ions C III, O V, Ne VII, Mg IX, Si XI, S XIII, Ar XV, Ca XVII, Ti XIX, Fe XXIII, Zn XXVII, Kr XXXIII, Mo XXXIX, and Xe LI by a Coulomb-Born approximation with exchange and including relativistic effects and configuration interactions. The cross-section and rate coefficient data are fitted by simple functions of the (scaled) electron impact energy and temperature, respectively. Level energies, mixing coefficients, and transition wavelengths and probabilities are also given.