The binding energies of the 4s²4p²P ground state in Ca^- have been determined by means of state-selective photoionization of Ca atoms produced in s-wave photodetachment to be 24.55±0.10 meV for the J0ex0ex=0ex0ex1/2 and 19.73±0.10 meV for the J0ex0ex=0ex0ex3/2 component. The sensitivity of the detection technique applied has also made it possible to disprove previous claims for the observation of a metastable 4s4p²⁴P state in Ca^-.
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Petrunin et al. (1996) studied this question.
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