Theoretical simulation of the decay of the4s4pP1o1level in Kr vii following beam-foil excitation

The decay of the $4s4p{}_{}{}^1{}_{}{}^{}P_1^o{}_{}{}^{}$ level in Krvii following beam-foil excitation has been simulated using theoretical initial-state populations and calculated transition probabilities. It was found that the decay curve was substantially influenced by cascading from higher levels and that such cascades dominate the decay in the region beyond three times the lifetime of the $4s4p{}_{}{}^1{}_{}{}^{}P_1^o{}_{}{}^{}$ level. The simulation is in good agreement with an experimental decay curve at short decay times, but is unable to reproduce the long-time behavior of the experimental data. However, recent spectroscopic evidence indicates that line blending is responsible for this aspect. Complications due to core-excited states and other complex cascade mechanisms are discussed.