Complete and independent randomisation of the carbon and hydrogen atoms, before fragmentation, in the molecular ion of pyridine, and complete randomisation of fluorine and hydrogen atoms in the molecular ion of fluorobenzene, before fragmentation, have been demonstrated in the mass spectrometer by isotopic labelling experiments.
R. J. Dickinson and D. H. Williams, J. Chem. Soc., Perkin Trans. 2, 1972, 1363 DOI: 10.1039/P29720001363
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