We have observed a multitude of resonance phenomena in the photoelectron spectrum of atomic calcium excited in the $3p$ threshold region. Their detailed interpretation needs extensive theoretical insight; nevertheless, we distinguish some systematic connections between resonant intermediate levels and final-state photoelectron distributions. Finally, the lowest $3p$-ionization threshold, at 30.8 eV, is measured here, for the first time, from Auger lines observable only under resonant excitation conditions.
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Bizau et al. (1984) studied this question.
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