Abstract
Nonrelativistic fixed-core valence-shell configuration interaction calculations are carried out for excited states of atomic negative ions in the range H through Ca, in an effort to identify the ones which are metastable against autoionization. Approximate relativistic corrections are included in some cases. From Be onwards, all (Core) n ( n+1)s q ( n+1)p r neutrals appear to bind an extra electron into a bound ( Core) n(n+1) s q(n+1) p r+1 2S+1 L negative ion, in all cases where the 2 S+1 L continuum starts at the corresponding neutral atom state. Similarly as in the recently discussed case of Li −, alkali-earths (Be −, Mg −, Ca −), Zn −, B −, Al −, C −, Si −, Ar −, and possibly S −, have two bound excited states connected by an E1 transition in regions extending from infrared to vacuum ultraviolet. Negative neon is found to decay by E1 radiation into a continuum, thus Ne − beams are unlikely to be made in the future. However, there exists a metastable [Ne]3p 54s4p 4S state of negative argon, making possible the production of Ar − beams.
Published Version
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