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Demonstration of two-electron (shake-up) photoionization and population Inversions in the visible and VUV

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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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