
%0 Journal Article
%A R Peterson, James 
%T Ca? and Its Elusive Properties
%J Australian Journal of Physics
%D 1992/06/01
%V 45
%N 3
%P 293-308
%K 
%R https://doi.org/10.1071/PH920293
%U https://www.publish.csiro.au/paper/PH920293 
%X The historical progression of theoretical and experimental information on the properties of the two electronic states of the Ca- ion is reviewed. New results are described that have revealed a shape resonance and a Cooper minimum, and have yielded a much lower electron binding energy for the ground state Ca- 2p of only 18·4±2·5 meV compared with the previous value of 43±7 meV, and have also confirmed earlier observations of the metastable 4p state. Some important uncertainties still exist and are noted. 
