Ab initiocalculation of angular distribution patterns of resonant photo double-ionization in neon

Angle-resolved patterns of the differential cross section for resonance-affected photo double-ionization in neon under the conditions of equal and slightly unequal energies of the ejected electrons are calculated using ab initio N-electron scattering wavefunctions that take into account interference, exchange and correlation effects. Post-collisional interactions are included a posteriori, correcting the direct and resonant amplitudes in the scattering wavefunctions by means of separate correlation factors taken from the literature. The method used for constructing scattering wavefunctions with two electrons in the continuum is described in detail. Comparison between theoretical cross sections convoluted with apparatus functions and available experimental data (Schaphorst S J, Jean A, Schwarzkopft O, Lablanquie P, Andric L, Huetz A, Mazeau J and Schmidt V 1996 J. Phys. B: At. Mol. Opt. Phys. 29 1901; Rioual S, Rouvellou B, Avaldi L, Battera G, Camilloni R, Stefani G and Turri G 2000 Phys. Rev. A 61 044702 and Rioual S, Rouvellou B, Avaldi L, Battera G, Camilloni R, Stefani G and Turri G 2001 Phys. Rev. Lett. 86 1470) shows close agreement. Resonant, direct and interference contributions to the differential cross sections and geometrical features of the electron emission are analysed in detail.