Strongly perturbed Rydberg series originating from KrII 4p45s ionic states

Photoionization cross-sections for the 4p4(3P) 5s 4P5/2,3/2,1/2 satellites and 4s, 4p main levels of Kr II in the exciting-photon energy range between 28.48 and 28.70 eV with extremely narrow bandwidth (1.7 meV at 28.55 eV) of the monochromatized synchrotron radiation were measured utilizing the photon-induced fluorescence spectroscopy. The observed resonances were assigned to the 4p4 5s(4 P1/2)n p and 4p4 5s(2 P3/2)n p Rydberg series on the basis of calculations performed with taking into account core relaxation and interaction between many resonances and many continua. The calculation shows that the resonance structure in the photoionization channels exists due to 4p4(1D) 5s 2D5/26p3/2 promoter state which also strongly perturbs the above Rydberg series.