Optical emission from the (2p2p2p) 4 S 0 states in three-electron systems has been studied both experimentally and theoretically. The wavelengths and transition rates have been calculated for the (2p2p2p) 4 S 0 -(1s2p2p) 4 P transition for the lithium-like ions ranging from Z=2 to Z=9. In foil-excited fast beams this transition has been observed for Li I and Be II at 145.02+or-0.05 AA and 80.85+or-0.03 AA, respectively. The experimental and theoretical data for Li I and Be II agree closely.
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Agentoft et al. (1984) studied this question.
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