Localized or delocalized K-holes in N2: Photoelectron-Auger electron coincidence experiments with high energy resolution

For K-shell ionization of N$_2$ photoelectron auger electron coincident angular distributions show that pathways with gerade and ungerade K-hole state can interfere. On the other hand high resolution photoelectron spectroscopy seems to indicate that the gerade and ungerade hole state can be separated in energy. The present experiment aims to combine the high energy resolution with full angular detection of Auger and Photoelectron to resolve this seeming contradiction