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In this work experimental and theoretical results will be presented for (e,2e) ionization measurements from laser-excited and aligned atoms. The experimental data are taken in Manchester, whereas theoretical results are from the groups of Don Madison in Missouri, and James Colgan at Los Alamos Labs in the USA. The motivation for these studies arises since time-independent distorted wave (DWBA, 3DW) models predict zero flux for atoms aligned orthogonal to the scattering plane (as in fig 1,2), in disagreement with experimental data. By contrast, time-dependent close coupling (TDCC) models predict a non-zero crosssection under these conditions, and conclude it is the unnatural parity contributions to the cross section that produce this flux [1-4]. An unnatural parity state has parity (−1), compared to a natural parity state that has parity (−1).

Electron-Impact Ionization of Laser-Aligned Atoms – Contributions from both Natural and Unnatural-Parity States.