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The theory of radiation due to free–free transitions by electrons in a plasma has been the subject of much work. Elwert has given an exact theory for binary electron-ion encounters but there has been doubt about the applicability of the formulae when an electron moves in the field of many ions at comparable distances; it is the aim of this paper to remove that doubt.
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P. A. G. Scheuer (1960) studied this question.
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