Abstract
Electron-impact excitation of the ground state of hydrogen into the states is studied by propagating the R-matrix in the two radial dimensions. Integral cross sections and resonance parameters are presented for collision energies from 0.75 Ryd (the n = 2 threshold) up to 0.96 Ryd (the n = 5 threshold). Below the n = 3 threshold, there is very good agreement with results from other methods and with experimental data. Between the n = 3 and n = 4 thresholds, integral cross sections are in better agreement with those of a coupled pseudostate method than with those of the J-matrix method, while resonance parameters are in good agreement with those of a 15-state R-matrix calculation.
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