Localization of inner-shell photoelectron emission and interatomic Coulombic decay in Ne 2

This is the authors' abstract. We don't add key points for this paper.

We used cold target recoil ion momentum spectroscopy (COLTRIMS) to investigate the decay of Ne 2 after K-shell photoionization. The breakup into Ne 1+ /Ne 2+ shows interatomic Coulombic decay (ICD) occurring after a preceding atomic Auger decay. The molecular frame angular distributions of the photoelectron and the ICD electron show distinct, asymmetric features, which imply localization of the K-vacancy created at one of the two atomic sites of the Ne 2 and an emission of the ICD electron from a localized site. The experimental results are supported by calculations in the frozen core Hartree–Fock approach.