Abstract
The ability to obtain daughter ion formulas via comparison of MS n spectra of parent ions containing only 12C with those of parent ions with one 13C (from the natural 13C abundance) is shown for cases in which isobaric interferences with the 13C-containing ion preclude the use of the conventional tandem mass spectrometric approach. This method allows the presence of isobaric daughter ions to be ascertained, and unexpected, complex dissociation pathways to be identifed. A three-dimensional quadrupole ion trap is used for these experiments. Its high tandem mass spectrometry efficiency makes possible this type of experiment.
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