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2. Instrumentation
A GDMS instrument consists of a glow discharge source to form ions, a mass spectrometer comprising a mass separator and a detector, and a data acquisition and processing system (Figure 7 ).
2.1 Glow discharge sources
Schematically, a glow discharge source consists of a cathode (the sample to be analyzed), an anode, and an insulating block separating the two electrodes. The source is pressurized with argon, before the electrical discharge is applied between the two electrodes.
Various glow discharge lamp geometries have been, and are still being, developed for use in GDMS
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Instrumentation
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Commercial instruments
(non-exhaustive list)
While many GDMS in use have been developed by analytical R laboratories from ICPMS, SSMS, electron impact source mass spectrometers, etc., various manufacturers have marketed GDMS. These include :
Fisons/VG, which in 1983 marketed a high-resolution magnetic sector GDMS, the VG 9000 (undoubtedly the best-selling GDMS),...
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