Benchmark calculations for e-H scattering between the n=2 and n=3 thresholds

We present eigenphase sums and partial cross sections for elastic scattering and electron-impact excitation of the n = 2 states of atomic hydrogen for incident electron energies between the n = 2 and n = 3 thresholds. These results were obtained by using the convergent close-coupling (CCC), R-matrix with pseudo-states (RMPS), and intermediate-energy R-matrix (IERM) methods. The agreement between the predictions from all three approaches is excellent, indicating that the effects of both the discrete and the continuum states in the close-coupling expansion have been treated to convergence. Very good agreement is also obtained with the experimental data of Williams.