Debye's cover

Debye's shell (also called electrostatic shielding) - is a plasma layer that has an excess of positive ions, and thus an excess of positive charge, which balances the negative charge of the surface to which it adheres. The length of the shell is a number of Debye's lengths, which in turn depend on a number of plasma properties (density, temperature, etc.).

The formation of Debye's plasma in the plasma is due to the fact that electrons generally have a temperature greater than or equal to the order of magnitude because they are much lighter. Consequently, they are faster than the ions by at least a factor m i / m e {\displaystyle {\sqrt {m_{\mathrm {i} }/m_{\mathrm {e} }}}} . Electrons collide with the surface of the material, making it negatively charged against the surrounding plasma. Due to Debye's shielding, the transient thickness of the transition region is Debye's length & # x03BB; D {\displaystyle \lambda _{\mathrm {D} }} . As the potential grows, more and more electrons are reflected by the envelope potential. The equilibrium occurs when the potential difference is several times the electron temperature.

Debye's shell is the transition between the plasma and the surface of a solid. Similar phenomena occur between plasma regions with different characteristics. The transition zone between such regions is known under the name of a double layer, having one positive and one negative layer. Bibliography

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