Glow Discharge Ion Source with Fourier Transform Ion Cyclotron Resonance MassSpectrometric Detection

摘要

A glow discharge ion source has been coupled to a Fourier transform ion cyclotronresonance mass spectrometer using a series of four electrostatic lenses to accelerate and focus ions generated external to the instrument's high magnetic field into its analyzer cell. Like other glow discharge mass spectrometers, glow discharge-Fourier transform ion cyclotron resonance can provide a quantitative measure of bulk analyte concentration with good precision and accuracy. Although detection limits currently attainable are several orders of magnitude higher than the commercially available magnetic sector based instrument, this approach holds promise for ultra high mass/ultra high resolving power mass analysis. Several schemes are proposed to lower the detection limits of the technique while still providing high enough resolution to resolve isobaric interferences.