Abstract
The contributions of autoionizing resonances to the electron-impact excitation-rate coefficients for the n = 2 to n = 2 transitions in Be-like ions have been evaluated for six ions with atomic numbers Z = 30, 34, 36, 42, 47, and 54. The calculations were carried out in the isolated-resonance approximation. Interference between direct and resonance channels was neglected. The detailed Auger and radiative rates were computed using the multiconfiguration Dirac-Fock model. Results for the 45 transitions among 10 states from 1 s 22 l2 l′ configurations are listed. For electric-dipole-allowed transitions, the contributions from the autoionizing resonances are quite small. However, the autoionizing resonances can enhance the excitation rates by a factor of 2 to 4 for dipole-forbidden transitions.
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