Decay of a2pInner-Shell Hole in anAr+Ion

Direct measurements of the photoelectrons or Auger electrons associated with inner shell ionization of positively charged ions are extremely difficult and rarely realized. We propose an alternative method to simulate such measurements, based on core valence double photoionization of the neutral species. As an example, we obtain the spectroscopy, lifetimes, and Auger decays of the states arising from $2p$ inner shell ionisation of an ${\mathrm{Ar}}^{+}$ ion. Observations compare well with theoretical predictions obtained within multiconfigurational Dirac-Fock formalism.