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Metastable transitions in n ‐butane and n ‐butane‐ d 7
Author(s) -
Smith Richard D.,
Futrell Jean H.
Publication year - 1976
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.1210110311
Subject(s) - butane , metastability , deuterium , ion , kinetic isotope effect , chemistry , hydrogen , molecule , mass spectrometry , hydrogen atom , analytical chemistry (journal) , atomic physics , physics , alkyl , organic chemistry , catalysis , chromatography
Metastable ions have been investigated for n ‐butane d 7 molecular ions using a tandem mass spectrometer which samples unimolecular decay processes occuring during the time interval of c.2 μs to 4 ms after ion formation. Some 37% of ions formed by 70 eV electron impact decay on this time scale. The competing unimolecular processes observed, in order of relative importance, are methance, methyl radical and hydrogen atom elimination. The slow metastables sample the threshold energy regime of unimolecular reactions responsible for forming the ordinary mass spectrum of butance and very large isotope effect are noted for the deuterated molecule.