Quasi-metastable quartet levels in alkalilike atoms and ions.
We describe the properties of a subclass of quartet levels of alkalilike atoms and ions that often retain metastability against autoionization and may have large radiative yields. Gain cross sections for XUV lasers with wavelengths between 20 and 100 nm are given.
Harris
S E
SE
Walker
D J
DJ
Caro
R G
RG
Mendelsohn
A J
AJ
Cowan
R D
RD