Multi-Vacancy Effects in Argon K-Spectra

We have carried out coordinated measurements of K series emission and absorption spectra in atomic argon. Specificially, emission spectra (especially in the region of Kβ1,3) were recorded with photon excitation energies ranging from below the single‐ vacancy threshold to energies above most important double‐vacancy thresholds. Satellite emission spectra were modelled using both Dirac‐Fock and Configuration Interaction calculations. Comparisons with experiment show reasonable agreement of the CI calculations for the first high energy satellite complex, βV, but not for the second, β″.