Stabilization calculations of the low-lying temporary anions states of Be, Mg, and Ca

The stabilization method is used in conjunction with the equation-of-motion electron-attachment coupled-cluster method to calculate the complex energies of the ²P temporary anion states of Be and Mg as well as of the ²D temporary anions states of Mg and Ca. The calculated resonance parameters for the ²P state of Mg⁻ and ²D state of Ca⁻ agree well with experiment. Experimental results are not available for the ²P anion of Be, but we note that our calculated resonance parameters of ²P Be⁻, while in good agreement with the CI results of McNutt and McCurdy (1983), differ significantly from the results of two other recent theoretical studies.