Abstract
Certain core-excited quartet levels in alkalilike atoms and ions, termed quasi-metastable, have slow autoionizing rates and comparable (relatively fast for quartets) VUV radiative rates.1 This circumstance, desirable for laser transitions, is due to angular momentum and parity selection rules on these quarters and the doublets to which they may couple via the spin-orbit interaction.
© 1986 Optical Society of America
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