This process makes that a gas discharge plasma typically emits a characteristic glow (and is therefore also called “glow” discharge). The ionisation collisions. Large scale numerical simulations of the spatiotemporal plasma flow in Two‐dimensional argon glow discharge simulations coupled with neutral (metastable). How to generate plasma with DC glow discharge technology. An introduction to principle of DC glow discharge.
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The initial population of ions and electrons collides with other atoms, exciting or ionizing them.
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As long glow discharge plasma the potential is maintained, a population of ions and electrons remains. Secondary emission[ edit ] Some of the ions' kinetic energy is transferred to the cathode.
What is a gas discharge and what is it used for ?
This happens partially through the ions striking the cathode directly. The primary mechanism, however, is less direct.
Ions strike the more numerous neutral gas atoms, glow discharge plasma a portion of their energy to them. These neutral atoms then strike the cathode. Whichever species ions or atoms strike the cathode, collisions within the cathode redistribute this energy resulting in electrons ejected from the cathode.
Electric glow discharge - The Plasma Universe theory (Wikipedia-like Encyclopedia)
This process is known as secondary electron emission. Once free of the glow discharge plasma, the electric field accelerates electrons into the bulk of the glow discharge.
Atoms can then be excited by collisions with ions, electrons, or other atoms that have been previously excited by collisions.
Light production[ edit ] Once excited, atoms will lose their glow discharge plasma fairly quickly. Of the various ways that this energy can be lost, the most important is radiatively, meaning that a photon is released to carry the energy away.
In optical atomic spectroscopyglow discharge plasma wavelength of this photon glow discharge plasma be used to determine the identity of the atom that is, which chemical element it is and the number of photons is directly proportional to the concentration of that element in the sample.
Some collisions those of high enough energy will cause ionization. In atomic mass spectrometrythese ions are detected. Their mass identifies the type of atoms and their quantity reveals the amount of that element in the sample.
Glow discharge - Wikipedia
Regions[ edit ] A Crookes tube illustrating the different glowing regions that make up a glow discharge and a diagram glow discharge plasma their names. The illustrations to the right shows the main regions that may be present in a glow discharge.
Regions described as "glows" emit significant light; regions labeled as "dark spaces" do not.
As the discharge becomes more extended i. That is, alternating dark and bright regions may form. Compressing the discharge horizontally will result in fewer regions.
Gas discharge plasmas - University of Antwerp
The positive column will be compressed while the negative glow will remain the glow discharge plasma size, and, with small enough gaps, the positive column will disappear altogether. In an analytical glow discharge, the discharge is primarily a negative glow with dark region above and below it.
Cathode layer[ edit ] The cathode layer begins with the Aston glow discharge plasma space, and ends with the negative glow region.
The cathode layer shortens with increased gas pressure.