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GDS (Glow Discharge Source, Glimmlampe)
GDS uses a low-pressure glow discharge
chamber where the solid sample acts as the cathode. The part of the sample
that has contact to the discharge is being sputtered by Argon-ions that are
accelerated in the plasma towards its surface ("cathode sputtering").
At the same time the sample material that is being eroded at a spot of 1 to
8mm is being excitated in the plasma. The intensity of the emitted light is
low so that sensitive spectrometers are necessary.
Glow-discharge-sources are suited very well for surface- and layer-analysis because of the nearly flat and parallel sample erosion. Since about 15 years rf-operated sources are common; these systems allow as well the analysis of conductive and non-conductive samples.
By special sample holders today also cylindrically or spherically shaped and even porous samples can easily be run without any problems and without embedding.
rf/dc-GDS-source with typical samples
Spectral Systems sales besides spare parts for
several GDS-Spectrometers also add-ons (for example a sample adapter for
round samples, sets for retrofittings and seperate stand-alone GDS-systems.
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