Electron-hydrogen-atom scattering at intermediate energies

Results of an accurate calculation based upon the new intermediate-energy R-matrix theory are reported for electron-hydrogen-atom scattering up to 5 Ryd. Cross sections for elastic scattering and 1s-2s and 1s-2p excitation processes are presented for ¹S^e, ³S^e, ¹P^o, ³P^o, ¹D^e, and ³D^e partial-wave symmetries. The calculation also yields phase-shifts and resonance positions and widths below the n=2 threshold which are in good agreement with previous accurate calculations.