Relativistic distorted-wave procedures with pseudostates
Guo-Xin Chen

The relativistic distoted-wave (RDW) procedures developed in [Chen, Phys. Rev. A {\bf 53}, 3227 (1996)] has been extended to include pseudo states. The RDW procedures with pseudo states are applied to the calculation of electron impact excitation (EIE) of \fe17. Pseudo states are shown to have a significant effect on the cross sections for important transitions such as 3C ($\lambda$\,15.015\,{\AA}) and 3D ($\lambda$\,15.262\,{\AA}) of \fe17. The convergence of the RDW calculations has been carefully investigated. The present RDW calculations of \fe17 are further compared with our previous close coupling results using the fully relativistic Dirac {\sl R}-matrix (DRM) method, where resonance and more complete channel coupling effects were included in addition to the background direct excitations. The present RDW calculations are in good agreement to the background cross sections from the DRM calculations. This agreement indicates the mutual confirmation of the validity of both the RDW and the DRM calculations of the direct or background EIE cross sections.

© 2008 The American Physical Society.