ROLE OF FINAL-STATE CORRELATIONS IN ELECTRON AND POSITRON-IMPACT IONIZATION OF H AND HE

BECKER A, JETZKE S, Faisal F. ROLE OF FINAL-STATE CORRELATIONS IN ELECTRON AND POSITRON-IMPACT IONIZATION OF H AND HE. In: Hyperfine Interactions. HYPERFINE INTERACTIONS. Vol 89. BALTZER SCI PUBL BV; 1994: 83-93.Single ionization of H and double ionization of He are investigated using a multiple scattering approach and a correlated final state wavefunction, which satisfies the correct asymptotic condition for the electron and positron impact ionization of atoms. Analyses presented here show the influence of the Coulomb correlations in the final state on the three- and fivefold differential cross sections. Situations are discussed in which consideration of every pair of electron-electron and/or electron-positron correlation in the final state becomes important for physically satisfactory results

ELECTRON-IMPACT IONIZATION OF ATOMIC-HYDROGEN

JETZKE S, ZAREMBA J, Faisal F. ELECTRON-IMPACT IONIZATION OF ATOMIC-HYDROGEN. ZEITSCHRIFT FUR PHYSIK D-ATOMS MOLECULES AND CLUSTERS. 1989;11(1):63-69

Unambiguous ionisation amplitudes for electron hydrogen scattering

According to quantum collision theory, scattering amplitudes are complex numbers, which are completely defined by their magnitude and phase. Although the phase information is generally not determined entirely in collision experiments, the phases are well defined and can be used to check computational models. We use four state-of-the-art approaches to calculate the magnitude and phase of the electron-hydrogen ionization amplitude in the Temkin-Poet S-wave model. We demonstrate that the correct phase can be extracted for each method by using the appropriate final-state continuum functions