Abstract
In stationary glow plasmas, thermal equilibrium of the electron gas with the neutral gas is established, if, with increasing gas pressure, the diffusion lifetime of plasma electrons becomes high enough. In D2-plasmas, thermal equilibrium sets in at higher pressures than in H2. Equal electron temperatures are measured in H2- and D2-glows, if the corresponding gas pressures are in the ratiop d 2/P h 2=1.22. This isotopic effect of electron temperature and of thermal equilibrium is compared with calculations of the Boltzmann equation, taking into account the influence of ambipolar diffusion on the electron velocity distribution. There is a good agreement between measurement and theory.
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The experiments have been carried out in the Sektion Physik, Lehrstuhl Prof. Rollwagen.— The authors are indebted to Prof. Dr. W. Rollwagen and to Prof. Dr. A. Heisen for their kind interest and support of this work.
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Franck, G., Elsner, J. Isotopic effects in the establishment of thermal equilibrium of stationary H2- and D2-glow plasmas. Z. Physik 264, 39–49 (1973). https://doi.org/10.1007/BF01392415
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DOI: https://doi.org/10.1007/BF01392415