title: Threshold electron-impact ionization mechanism for hydrogen atoms.
abstract: The near-threshold evolution of electron-impact ionization of hydrogen is revealed with measurements of the angular and energy correlations of the outgoing electrons down to 0.05 eV. The single-, double-, and triple-differential cross sections in the perpendicular plane are measured simultaneously using a dual wedge-and-strip detector on a single-toroidal energy analyzer, avoiding many experimental problems. The experimental and calculated data are in excellent agreement, within the experimental precision of +/-10%, and provide further evidence that the accurate solution of the Schrödinger equation provides a complete description of the reaction dynamics of near-threshold ionization.
authors.affiliation: Centre for Atomic, Molecular and Surface Physics, University of Western Australia, Perth 6009, Australia.
authors.forename: J F
authors.initials: JF
authors.lastname: Williams
authors.forename: Philip L
authors.initials: PL
authors.lastname: Bartlett
authors.forename: Andris T
authors.initials: AT
authors.lastname: Stelbovics