S-WAVE MODEL FOR H-LIKE IONS

We present convergent close-coupling calculations of electron scatteri ng on H-like ions within the framework of the S-wave model. The onset of Z(4) scaling is demonstrated. In addition, elimination of pseudores onances in the singlet channel is studied via variation of the exponen tial parameter in the Laguerre basis. The absence of pseudoresonances in the triplet channel is explained by reference to single-differentia l ionization cross sections. These considerations have application to recently developed R-matrix with pseudostates techniques.