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On the Correct Form of the Saha Equation for Two-Temperature Plasmas |
| HAN Peng;CHEN Xi;LI He-ping |
| Department of Engineering Mechanics, Tsinghua University, Beijing 100084 |
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| Cite this article: |
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HAN Peng, CHEN Xi, LI He-ping 1999 Chin. Phys. Lett. 16 193-195 |
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Abstract Two quite different Saha equations modified to a two-temperature plasma were proposed and employed in many literatures. In order to clear up this confusion phenomenon lasted for a few decades in the community of thermal plasma science and technology, this paper re-examines the thermodynamic derivation of the two-temperature Saha equations. It is pointed out that the modified Saha equation deduced by using the minimum Gibbs or Helmholtz free energy is incorrect for the two-temperature plasma. Instead, a more rigorous derivation is presented here from the basic thermodynamic principle that the entropy in an isolated system always assumes its maximum value at chemical equilibrium.
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| Keywords:
52.25.Kn
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Published: 01 March 1999
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| PACS: |
52.25.Kn
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(Thermodynamics of plasmas)
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