We present experimental evidence for the existence of a stable Ca^- ion formed in the bound (4s²4p)²P state. This result represents the first report of a stable negative ion for a group-IIA element. The structure of Ca^- was determined by means of photoelectron detachment spectroscopy. The electron affinity of Ca was measured to be 0.43±{}0.007 eV, which is in good agreement with a recent calculation.
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Pegg et al. (1987) studied this question.
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