Fulcher-α Band Spectra in Mixed Hydrogen Isotope Plasmas

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The Fulcher-α ro-vibronic band spectra in mixed hydrogen isotope plasmas were investigated. The spectra were measured in H2 and D2 mixed plasmas as well as calculated for D2 and T2 mixed plasmas. In both the measured and calculated spectra, several overlaps were observed. In order to avoid an error in the ro-vibrational temperature estimation, detailed assignment of the spectral line shapes are reguired. The coronal model combined with a fitting procedure which is not largely disturbed by the decrease in the number of available lines was adopted to evaluate the ro-vibrational temperatures. The estimated vibrational temperatures of H2, D2, and HD isotopes were not fully equilibrated, and may be explained by a combination of the electron-impact and Eley-Rideal surface recombination processes. The rotational temperatures, on the other hand, were basically in equilibrium, and suggest a correlation with the surface temperature.