Abstract
Detailed calculations of the electron-impact excitation of the sodiumlike ion were performed using both the unitarized Coulomb-Born approximation and the close-coupling approach. Calculations were undertaken at both the five-state (3s, 3p, 3d, 4s, and 4p) and nine-state (+4d¯, 4f¯, 5s¯, and 5p¯) levels of approximation. Calculations using Hamiltonians both with and without (semiempirical) core-polarization potentials were completed. Particular attention was paid to the resonance (3s-3p) excitation. The inclusion of core-polarization potentials resulted in cross sections for the resonance excitation that are 10% smaller in magnitude. As an additional check on the calculations, binding energies of bound states, and oscillator strengths for transitions, were also computed and compared with the results of measurements and other calculations.
- Received 29 June 1988
DOI:https://doi.org/10.1103/PhysRevA.39.537
©1989 American Physical Society