$R$-matrix with pseudo-states calculation for electron scattering from rubidium

We have applied an $R$-matrix with pseudo-states model to calculate electron scattering from rubidium atoms. Using a semi-empirical model potential to describe the Rb$^+$core~[1], we obtain a highly accurate description of the target valence spectrum. Results will be presented for total and angle-differential cross sections, spin-polarization and asymmetry functions, and various electron-impact coherence parameters. The convergence of the theoretical predictions with the number of states in the close-coupling expansion is analyzed. Comparison of the results with recent experimental data [2,3] shows satisfactory though by no means perfect agreement. \par\noindent [1] K. Bartschat, {\it Computational Atomic Physics} (Springer, 1996), Ch.~2. \par\noindent [2] B.V. Hall {\it et al.}, J. Phys. B {\bf 37} (2004), 1113. \par\noindent [3] W.E. Guinea {\it et al.}, J. Phys. B {\bf 38} (2005), in press.