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.