Cascade processes after 3p-shell threshold photoionization of Kr

Yield spectra of the multiply charged ions Kr2+, Kr3+, Kr4+ and Kr5+ in coincidence with threshold electrons (E-k less than or equal to 0.03 eV) have been measured near the 3p-shell ionization region of Kr. Profiles of post-collision interaction (PCI) effects induced by Auger cascades following 3p-shell threshold ionization are derived from these coincidence spectra. On the basis of the PCI profiles, the number of Auger cascade steps for each of the decay channels leading to the formation of the multiply charged ions in 3p(3/2)- and 3p(1/2)-shell threshold ionization of Kr was determined, and the branching ratios of the decay channels were estimated.