On the spectral profiles of optical transitions to the autoionizing 7d′ and 9s′ levels and configuration interaction in 7d′ levels of Kr

Abstract

Spectral line shapes of the optical transitions from the 5p′ to the autoionizing 7d′ or 9s′ levels of Kr are found by optogalvanic spectroscopy to be symmetric, in contrast to the asymmetric profiles of the ordinary autoionization lines and the widths of some of the observed lines which are varied by changing the pumped level in an optogalvanic double-resonance spectroscopy. We conclude from the analysis of this behavior that the direct photoionization which introduces the asymmetric profile by interference with the autoionizing transition is negligibly weak and that the autoionizing levels which are close to each other are mixed by a second-order configuration interaction through the continuous levels. Based on this analysis, the accurate term values of the autoionizing 9s′ and 7d′ levels are determined.