Abstract
The ejected-electron spectrum for H+ incident on H2 and He at 40 keV is examined experimentally and theoretically. The continuum-distorted-wave eikonal-initial-state (CDW-EIS) model is adopted to study the ionization process. Experimentally a 260 mm diameter hemispherical analyser with half-angle acceptance of 1.5° and energy resolution E/E of 0.012, is used to measure the velocity distribution of the emitted electrons. The analyser and the surrounding interaction region are double shielded against the Earth's magnetic field by use of µ-metal enclosures. The observations and calculations, for double differential cross sections (differential with respect to electron momentum and emission angle), are in very good agreement and show a spectrum dominated by a well defined electron capture to the continuum (ECC) peak although existence of saddle-point electrons at 0° is not confirmed.
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