Degree of ionization

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The degree of ionization (rarely also degree of ionization ) is a term from physics that is used specifically in plasma physics .

In plasma physics it is used to categorize plasmas and to describe different properties. It can assume values ​​between zero (completely neutral) and one (completely ionized, all electrons are free). However, the degree of ionization is not a simple quotient (e.g. in percent ) of two particle numbers or densities : Since atoms and molecules can be ionized several times and there are different ionization energies in gas mixtures , the individual parts of the gas contribute differently to the degree of ionization.

A frequently used mathematical formalism based on these considerations for determining the degree of ionization of a gas as a function of temperature , particle density and ionization energy is provided by the Saha equation .

Further information