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GD-MS – Glow Discharge Mass Spectrometry


A glow discharge is a plasma formed by the passage of electric current through a gas. 

It is often created by applying a voltage between two electrodes in a glass tube containing a low-pressure gas.

When the voltage exceeds a value called the striking voltage, the gas ionization becomes self-sustaining, and the tube glows with a colored light.

The color depends on the gas used.

Analyzing the light produced with spectroscopy can reveal information about the atomic interactions in the gas, so glow discharges are used in plasma physics and analytical chemistry. They are also used in the surface treatment technique called sputtering.

 




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