Abstract
Photoionization cross sections for the 4p4(3P)5s4P5/2,3/2,1/2 satellites and 4s → εℓ, 4p → εℓ main lines of Kr II were measured using the photon-induced fluorescence spectroscopy in the exciting-photon energy range between 27.80 eV and 29.44 eV with extremely narrow bandwidth (1.7 meV at 28.55 eV) of the monochromatized synchrotron radiation. The observed resonances were assigned to the 4p45s(4P1/2)np and 4p45s(2P3/2)np Rydberg series on the basis of the calculations including core relaxation and interaction between many resonances and many continua. The calculation shows that the resonance structure in the photoionization channels exists due to the 4p4(1D)5s2D5/26p3/2 and 4p4(1D)5s2D3/2 6p3/2,1/2 promoter states which strongly perturb the above Rydberg series.
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