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Evidence for a continuum of rate constants for gaseous unimolecular ion reactions
Author(s) -
Fairweather R. B.,
McLafferty F. W.
Publication year - 1970
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.1210040125
Subject(s) - metastability , ion , range (aeronautics) , atomic physics , reaction rate constant , chemistry , mass spectrometry , decomposition , physics , materials science , kinetics , quantum mechanics , organic chemistry , chromatography , composite material
Decay curves of product ion intensity versus lifetime have been obtained for twenty metastable transitions using a cycloidal mass spectrometer by the method of Benz and Brown. Consistent with the quasi‐equilibrium theory, but in contrast to previous evidence from this method, none of these data supports the existence of only one or two discrete rate constants for ion decomposition. A new method is utilized which increases the sensitivity and the range of measurable lifetimes for metastables by defocusing the ordinary product ions.