From a Single 1s Hole to a Multiply Charged Ion: the Cascade L23–MM Spectrum of Argon

Abstract

The L23–MM spectrum of argon emitted after 1s photoionization represents a superposition of several vacancy satellite spectra. They are separated by means of electron-ion coincidence spectroscopy. Excellent agreement of the gross spectral structure is found with a calculation in relativistic single configuration average approximation. With the aid of data from the literature we identify sequentially emitted L23[L23]–MM[L23] and L23[M2]–MM[M2] lines and locate intermediate 2p53p4 levels. Elaborate multiconfiguration Dirac-Fock calculations of transition energies and intensities have been performed for these two spectra. Their results show very good agreement with observation, thereby confirming and extending the experimental analysis. Other lines are shown to be known from the well investigated L23–MM and L23[M]–MM[M] spectra. Virtually all recognizable lines of the densely packed cascade spectrum are assigned.