Abstract
Accurate, normalized doubly-differential cross-sections, differential cross-section ratios and relative differential cross-sections for electron impact ionization, excitation to the H(n = 3,4) levels and elastic scattering of atomic hydrogen have been measured at incident electron energies ranging from 14.6 to 40 eV for scattering angles of 10° to 130°. The measurements are normalized to the accurate differential cross-section for electron impact excitation of H(n = 2) from the convergent close-coupling theory, which has recently been shown to be accurate within 10%. Our measurements show very good agreement in comparison with the most recent theoretical models viz. the Convergent Close-Coupling (CCC) model and the Exterior Complex Scaling (ECS) model.
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