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A microwave plasma in helical flow of atmospheric hydrogen gas is experimentally investigated. Because of a very small diameter of the plasma beam (about 1 mm) the ambipolar diffusion effect induces the deviation in the temperatures of electrons and heavy particles ( T e =12000 K, T g =9000 K at P i =25 kW, φ=800 l/min), and underpopulations of excited states with the electron deficiency are clarified.
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Arata et al. (1978) studied this question.
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