Abstract
It is shown, that the continuous spectrum (free-free radiation) of a plasma in a thermal equilibrium — if the degree of ionization is slight — is produced not only by the electron-ion impacts, but also to a considerable extent by the impacts of electrons with the neutral atoms. Under this assumption the radiation of a mercury arc plasma in the infra-red is calculated. The results are in good agreement with absolute radiation measurements in a wide range of frequencies and pressures.
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Hettner, G. Die Bremsstrahlung von Plasmen bei geringer Ionisation. Z. Physik 211, 483–490 (1968). https://doi.org/10.1007/BF01404561
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DOI: https://doi.org/10.1007/BF01404561