Decay of a 2p inner-shell hole in an Ar⁺ 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 use here 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 ionization of an Ar⁺ ion. Observations compare well with theoretical predictions obtained with multiconfigurational Dirac-Fock formalism.