Dirac R-matrix with pseudo-states

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Abstract

We describe the development of the Dirac R-matrix with pseudo-states (DRMPS) method for electron and photon collisions with arbitrary atoms and ions. An N-electron atom is represented by an anti-symmetrized product of single-particle spinors comprising the usual four-component Dirac spinors as well as paired two-component Laguerre spinors (L-spinors). The convergent L-spinor basis forms a discretization of the electron and positron continua. This representation has been implemented quite generally within the general relativistic atomic structure package (GRASP) specifically GRASP0. An (N + 1)th 'scattering' electron is represented by the exact same L-spinor basis plus the usual R-matrix box-state spinors which are chosen so as to form a combined complete finite linearly independent orthogonal basis. The (non-diagonal) Buttle correction is determined consistently. This representation has been implemented quite generally within the Dirac atomic R-matrix code (DARC). Results of some simple model problems are presented which demonstrate the correctness of the implementation. (Abstract from : http://iopscience.iop.org/0953-4075/41/17/175202/pdf/0953-4075_41_17_175202.pdf)
Original languageEnglish
Article number175202
Number of pages6
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume41
Issue number17
DOIs
Publication statusPublished - 14 Sep 2008

Keywords

  • Dirac R-matrix
  • pseudo-states
  • (DRMPS) method
  • electron and photon collisions
  • arbitrary atoms and ions

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