title: Threshold behavior of e-H ionizing collisions.
abstract: We present accurate ab initio numerical solutions of the full Schrödinger equation for the electron-impact ionization of hydrogen near threshold using the propagating exterior complex scaling method. They provide strong support for the Wannier threshold law [Phys. Rev. 90, 817 (1953)], giving sigma proportional to E(1.122+/-0.015), and also give the energy dependence of the electrons' angular distribution as (pi-theta12) FWHM approximately 3.0E(1/4), in general agreement with classical and semiclassical predictions.
authors.affiliation: Centre for Atomic, Molecular and Surface Physics, Murdoch University, Perth 6150, Australia. bartlett@fizzy.murdoch.edu.au
authors.forename: Philip L
authors.initials: PL
authors.lastname: Bartlett
authors.forename: Andris T
authors.initials: AT
authors.lastname: Stelbovics