Photoelectron recapture and reemission process associated with double Auger decay in Ar

Multielectron coincidence spectroscopy has been performed for Ar at a photon energy of only 0.2 eV above the 2p1/2 threshold. It is revealed that a postcollision interaction induced by double Auger decay leads to photoelectron recapture, followed by reemission of the captured electron, where the recapture of the slow photoelectron forms the Ar2+ Rydberg-excited states which subsequently undergo autoionization. The energy correlation of the emitted electrons discloses that both direct and cascade paths in the double Auger decay contribute to the photoelectron recapture.