Multiplet-dependent shake-up structures in high-resolution Auger spectra at 3${\mathit{d}}^{\mathrm{-}1}$4${\mathit{s}}^2$4${\mathit{p}}^6$np,n=5,6 resonances of Kr

Shake-up transitions during the Auger decay of the Kr 3${\mathit{d}}^{\mathrm{-}1}$np, n=5,6 resonance states have been studied with high photon and electron resolution (<0.1 eV) using the Aladdin undulator beamline in Stoughton, Wisconsin. This resolution enables us to resolve the complex spectra and study the distribution of intensity between the multiplets of the 4${\mathit{p}}^{\mathrm{-}2}$np final states. The intensity distribution between these multiplets has been found to depend strongly on the principal quantum number n, and theoretical intensity calculations are in good agreement with experiment. Correspondingly, shake fractions differ for each parent and also depend strongly on whether the electron is excited to the first or second Rydberg orbital.