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Dielectronic recombination has been directly observed with use of crossed beams of electrons and Mg⁺ ions. Measurements were made of delayed coincidences between the stabilizing photon near 280 nm and the resultant neutral atom, and cross sections were determined. Theoretical cross sections are more than a factor of 5 smaller than those measured.
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Belić et al. (1983) studied this question.
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