Sampling an RF-Powered Glow Discharge Source with a Double Quadrupole Mass Spectrometer

Abstract

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 M₂⁺, MAr⁺, MO⁺, and Ar₂⁺, and residual gas species. Exemplary CID mass spectra illustrate the enhanced reduction of potential molecular isobars relative to scattering losses of analyte (atomic) ions.

Keywords

Glow discharge mass spectrometry Molecular interferences Collision-induced dissociation

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