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Unimolecular decompositions of even‐electron ions
Author(s) -
McLafferty F. W.
Publication year - 1980
Publication title -
organic mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0030-493X
DOI - 10.1002/oms.1210150303
Subject(s) - ion , cleavage (geology) , chemistry , bond cleavage , electron , ionization , electron ionization , chemical bond , electron capture , photochemistry , computational chemistry , materials science , catalysis , organic chemistry , physics , quantum mechanics , fracture (geology) , composite material
Fragmentations of even‐electron ions of lifetimes ≥10 −5 s caused by electron and chemical ionization and by collisional activation have been correlated. Proposed reaction classifications include: cleavage of one bond with charge migration; cleavage of one bond through cyclization‐displacement; cleavage of two bonds in a cyclic ion with charge retention; and cleavage of two bonds in an acyclic ion with rearrangement and charge retention. Such reactions are compared with those of odd‐electron ions; despite a higher tendency for rearrangement, the decompositions of a positive even‐electron ion, in particular as displayed in its collisional activation spectrum, have substantial utility for characterizing its structure.