Abstract
The contributions of Coster-Kronig resonances to the electron-impact excitation rate coefficients have been calculated for six F-like ions with {ital Z}=26, 34, 42, 47, 54, and 63. The calculations are carried out using the relativistic distorted-wave approximation and the multiconfiguration Dirac-Fock model. We found that resonance excitation via Coster-Kronig transitions is the dominant excitation mechanism at low temperatures for {ital Z}{le}34 and is as important as the direct excitation for heavier ions. In addition, we found that the effects of relativity can reduce the rate coefficients by more than an order of magnitude at electron temperatures {ital T}{lt}100 eV.
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More From: Physical review. A, Atomic, molecular, and optical physics
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