Interference effects in angular patterns of resonant double photoionization in neon

For a well selected case of resonant double photoionization in neon, two specific aspects are studied in detail by exploring the shapes of energy- and angle-resolved patterns of the triple-differential cross section (TDCS). One concerns the evolution of TDCS patterns for equal energies of the emitted electrons when crossing the resonance. Here similarities and differences for direct and indirect double photoionization are demonstrated. The other aspect concerns the on-resonance pattern where the photoelectron has the same kinetic energy as the autoionization electron. In contrast to former studies of resonance-affected double photoionization, it is shown here for the first time that in the whole angular range of opposite electron emission the TDCS is strongly affected by interference effects predicted by Vegh and Macek (1994).