The possibility of determining the magnitude of neutral atom density in hydrogen plasma was investigated using Paschen-Back effect and resonant Faraday rotation of the polarization plane of light by residual neutral atoms in the plasma. In strong magnetic fields when the Zeeman shift is greater than the distance of the hyperfine structure energy levels the Paschen-Back effect is observed. In this case, it is no longer possible to speak about the independence of the splitting of each level of a given multiplet term.
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