Abstract. Low-pressure hydrogen plasma, ignited by a microwave antenna system working at a frequency of 2.45 GHz and heated by a main theta pinch device is the source of radiation. After heating the plasma and the high ionization stages of the impurity element, for example N₂, the electron temperature, T_e, can be estimated from the relative intensities of the spectral lines appearing at the successive ionization stages of the impurity elements. Also, the ion temperature, T_i, of impurity elements (such as N₂, O₂ and C₂) and the working hydrogen gas element can be determined using spectral line broadening mechanisms due to plasma heating. The ion temperature for H_α was approximately 6 eV in the cold plasma near the wall region, while it was 43 eV in the hot plasma core.

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