A double quadrupole mass spectrometer has been assembled to perform collision-induced dissociation (CID) of molecular ions sampled from a radio-frequency (rf) powered glow discharge atomization/ionization source. Low-energy ( E lab = 20 and 40 eV) collisions with argon target atoms efficiently dissociate species of the form M 2 + , MAr + , MO + , and Ar 2 + , and residual gas species. Exemplary CID mass spectra illustrate the enhanced reduction of potential molecular isobars relative to scattering losses of analyte (atomic) ions.
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Duckworth et al. (1990) studied this question.
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