Fully differential cross sections for electron-impact excitation-ionization of aligned D2

We examine fully differential cross sections for 176 eV electron-impact dissociative excitation-ionization of orientated D-2 for transitions to final ion states 2s sigma(g), 2p sigma(u), and 2p pi(u). In previous work [Phys. Rev. A 88, 062705 (2013)], we calculated these cross sections using the molecular four-body distorted wave (M4DW) method with the ground-state D-2 wave function being approximated by a product of two Dyson 1s-type orbitals. The theoretical results were compared with experimental measurements for five different orientations of the target molecule (four in the scattering plane and one perpendicular to the scattering plane). For the unresolved 2s sigma(g) + 2p pi(u) final states, good agreement with experiment was found for two of the five measured orientations, and for the 2p sigma(u) final state, good agreement was found for three of the five orientations. However, theory was a factor of 200 smaller than experiment for the 2p sigma(u) state. In this paper, we investigate the importance of the approximation for the molecular ground-state wave function by repeating the M4DW calculation using a better variational wave function for the ground state.