Product ion abundances of [C_(x)H_(y)O_(2) + Mn]~(+) following EID of Mn(II) adducted fatty acids allowed the determination of all double bond positions in these molecules. However, fatty acids with other metal adducts did not generally provide characteristic product ion abundances at all double bond locations, even when extensive charge-remote fragmentation was observed. The resulting structural information on double bond locations for Mn(II) adducted fatty acids may be explained by electronic excitation processes in EID, and efficient generation of a fixed charge at the carboxylate end, due to strong interaction between Mn~(2+) cation and carboxylate anion.
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