Experimental study of [formula omitted] autoionizing states

Abstract

Using a three-step laser excitation approach, we have studied the Sr 5 p 1 2 ns 1 2 (J = 1) autoionizing states. We have employed an isolated-core excitation scheme to determine the energies, widths and quantum defects of 5 1 2 ns 1 2 states for n ranging from 7 to 18. Substantial configuration interactions involved have been manifested in the observed line profiles of 5 p 1 2 ns 1 2 autoionizing states as variations of their scaled widths. The investigation agrees well with previous studies.