Spin-forbidden transitions in atomic Ca are treated using ab initio MCSCF/CI line strengths and atomic spectral data. The lifetime of metastable Ca 1 D 2 is computed to be 1.8 ms, in good agreement with a previously determined experimental value of 2.3+or-0.5 ms, confirming the largely spin-forbidden dipole-allowed character of this decay. The implications for other radiative processes in Ca as well as Sr and Ba are discussed.
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Diffenderfer et al. (1981) studied this question.
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