Abstract
The two-electron (shake-up) photoionization process has been shown to be an effective mechanism for producing large population inversions in He+ with gain at 164 nm and in Ar+ with gain at 428 and 477 nm and for observing the first autoionizing states in Cd+.1 Such a mechanism was recently proposed as an excitation mechanism for a VUV laser in lithium.2
© 1986 Optical Society of America
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