The R-Matrix with Pseudostates Method

Details The R-Matrix with Pseudostates Method The R-Matrix with Pseudostates Method

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000adnx.conf...97g&link_type=abstract

Atomic Data Needs for X-ray Astronomy, p. 97

Astronomy and Astrophysics

Astronomy

Matrix Theory, Electron States, Ionic Collisions, Electron Scattering, Electron Impact, Scattering Cross Sections, Aluminum, Lithium, Continuums, Wave Functions

Scientific paper

We review the development of pseudostate methods for treating electron-ion collision processes. We describe our implementation of these methods within the Wigner-Eisenbud R-matrix method. We present recent results for photoionization, electron-impact excitation, and electron-impact ionization, which demonstrate the importance of properly accounting for the two electron continuum. The comparison with experimental, as well as other theoretical, electron impact ionization results suggests that there may be inaccuracies in the overall normalization of earlier measurements. This is confirmed in the case of Al(2+) by a more recent experimental study. The implications regarding the use of excitation and ionization rates from existing databases for modeling astrophysical plasmas are discussed.

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