Autoionization of doubly excited Ar atoms into Ar^2^+ and Ar^+ continuum states - Samson, J.A.R.; Lee, E.-M.; Chung, Y. (Elsevier)
Numerous doubly excited neutral states of Ar have been observed by the use of photofluorescent and photoion spectrometry. These states are observed to autoionize into Ar^+ satellite states and into the Ar^2^+ continuum. Doubly excited Rydberg states with the configuration (3s3p^5)nl,n'l' are observed above the Ar^2^+ threshold. Possible decay pathways of these states are discussed.
http://linkinghub.elsevier.com/retrieve/pii/0368-2048(93)01839-7
Keywords: U