Evidence of radiative charge transfer in argon dimers

Auger electron spectra recorded in coincidence with two Ar+ ions produced from Ar22+ suggest that the bound one-site two-hole state, Ar2+(3p−2)–Ar, decays further only via radiative charge transfer to the dissociative two-site two-hole states Ar+(3p−1)–Ar+(3p−1). The measured kinetic energy release of Ar22+ agrees well with the theoretical estimate based on this process.