Electron temperature determination in LTE and non-LTE plasmas

Physics

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Dense Plasmas, Electron Energy, Plasma Equilibrium, Plasma Temperature, Argon, Electron Density (Concentration), Helium, Hydrogen, Thermodynamic Equilibrium

Scientific paper

A method is presented for calculating electron temperatures (Te) in dense plasmas, which does not assume equivalence with the excited level distribution temperatures (Tex). The method involves the upper-level Saha ionization equation at the ionization limit, the limiting weighted population density obtained from measured population densities and the experimentally obtained electron density. Electron temperatures calculated for 0.1-bar hydrogen and 1-atm helium and argon arcs are found to be up to twice as large as excited level distribution temperatures. For subatmospheric argon arcs, the calculated Te are equivalent to the excitation temperature of the middle levels, but are two to three times smaller than the quoted Tex for the highest levels. Reasons are discussed for the apparent invisibility of true electron temperatures and for differences between them and the excitation temperatures.

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