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Application of the convergent close-coupling (CCC) method to electron-impactionisation of the ground state of atomic hydrogen is considered at incidentenergies of 15·6, 17·6, 20, 25, 27·2, 30, 54·4,150 and 250 eV. Total through to fully differential cross sections arepresented. Following the analysis of Stelbovics (1999) the equal-energysharing cross sections are calculated using a solely coherent combination oftotal-spin-dependent ionisation amplitudes, which are found to be simply afactor of two greater than the incoherent combination suggested by Bray andFursa (1996). As a consequence, the CCC theory is particularly well-suited tothe equal-energy-sharing kinematical region, where it is able to obtainconvergent absolute scattering amplitudes, fully ab initio. This is consistentwith the step-function hypothesis of Bray (1997), and indicates that atequal-energy-sharing the CCC amplitudes converge to half the step size.Comparison with experiment is satisfactory in some cases and substantialdiscrepancies are identified in others. The discrepancies are generallyunpredictable and some internal inconsistencies in the experimental data areidentified. Accordingly, new (e, 2e) measurements are requested.

Electron-impact ionisation of atomic hydrogen from near threshold to high energies