Configuration interaction calculations of positronic atoms and ions

The configuration interaction (CI) method is one of the most commonly used methods for the calculation of the electronic structure of atoms. The stand ard CI method based on a linear combination of orthonormal orbitals centere d on the nucleus has been adapted to the calculation of the structure of ex otic atoms containing one or two electrons and a positron. Results of calcu lations on a number of systems, including positronium hydride (PsH), e(-)Cu , e(+)Li, e(+)Be, e(+)Cd and CuPs show both the strengths and limitations o f the CI approach for positron binding atoms. (C) 2000 Elsevier Science B.V . All rights reserved.