Journal of Physics B Atomic Molecular and Optical Physics · 1998 · 22 citations · 5 references
Natural SciencesPhysicsAtomic PhysicsNuclear PhysicsSpectroscopyAb Initio MethodsAtomic ExcitationAtomic IonizationElectron Beam PhysicsIonization ProcessesClose-coupling CalculationsElectron Beam ModulationElectron Impact IonizationElectron IonizationElectron-impact ExcitationIonization Cross SectionsIonization DynamicsIonization Thresholds
The absolute cross section for the ionization of from threshold to 400 eV has been measured using an electron beam modulation technique. The results are significantly higher than those of Crandall et al, and are in good agreement with recent convergent close-coupling and pseudo-state R-matrix calculations by Badnell et al for the direct contribution to the cross section below 80 eV. In addition, a fast energy-scanning technique has been employed to make detailed measurements of the cross section between 65 and 117 eV. Considerable structure due to indirect ionization was revealed and many of the individual features can be identified with particular autoionization processes involving the excitation of a 2p electron.
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