FLUORESCENCE STUDIES ON THE 3D-IONIZATION THRESHOLD RANGE IN KRYPTON

Krypton atoms were excited by photons in the energy range from the thr eshold for photoionization of the 3d-electrons up to 120 eV, and the f luorescence radiation in the spectral range from 780 to 965 angstrom w as observed and analyzed. Cross sections for the population of excited states in KrIII with at least one 4s-hole resulting from an Auger tra nsition as the first decay step and for KrII satellites were determine d. The energy dependence of the 3d-ionization cross section in the 3d5 /2- and the 3d3/2-threshold range was derived from the experimental da ta. The cross sections for production of KrII states were found to fol low the energy dependence of the 3d-cross sections.