Abstract

Emission from 100 psec laser-produced plasmas has been used to excite two-electron (shakeup) photoionization processes and produce large population inversions in He⁺ with gain at 164 nm and in Ar⁺ with gain at 428 and 477 nm. Shakeup processes have recently been used to identify autoionizing levels¹ in Cd⁺ and proposed as an excitation source² for VUV lasers m Li⁺.

© 1986 Optical Society of America