| The electron-spin asymmetry for electron-impact ionization of atomic hydrogen has been measured from the ionization threshold to 500 eV. Comparisons are made to the previous measurements of Fletcher et al. (1985), the predictions of the convergent close-coupling method of Bray and Stelbovics (1992, 1993) and the hidden-crossing theory of Macek, Ovchinnikov and Pasovets (1995), as well as related measurements on electron-atom systems. Subsidiary measurements reported include the characterization of the atomic-hydrogen beam via measurements of its electron-spin polarization, density and dissociation fraction; the characterization of the electron beam via measurements of its energy spread and polarization; and measurements of a dynamic beam-loading effect due to the ionization of residual hydrogen molecules. |
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