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Proposed mechanism for the formation of complementary ion pairs at m/z 344 and m/z 633, which are both observed in the He MAD spectrum of [9Z-DOPC+H]+. In both pathways, fragmentation occurs via homolytic cleavage alpha to the radical formed by Penning ionization of the double bond. The intermediate shows the radical on C10 of the sn-2 acyl chain, but pathway b assumes the radical starts on C9.
