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    UV continuum emission and diagnostics of hydrogen-containing non-equilibrium plasmas

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    For the first time the emission of the radiative dissociation continuum of the hydrogen molecule (a3Σg+b3Σu+a^{3}\Sigma_{g}^{+} \to b^{3}\Sigma_{u}^{+} electronic transition) is proposed to be used as a source of information for the spectroscopic diagnostics of non-equilibrium plasmas. The detailed analysis of excitation-deactivation kinetics, rate constants of various collisional and radiative transitions and fitting procedures made it possible to develop two new methods of diagnostics of: (1) the ground X1Σg+X^{1}\Sigma_{g}^{+} state vibrational temperature TvibT_{\text{vib}} from the relative intensity distribution, and (2) the rate of electron impact dissociation (d[\mbox{H_{2}}]/dt)_{\text{diss}} from the absolute intensity of the continuum. A known method of determination of TvibT_{\text{vib}} from relative intensities of Fulcher-α\alpha bands was seriously corrected and simplified due to the revision of dad \to a transition probabilities and cross sections of dXd \gets X electron impact excitation. General considerations are illustrated with examples of experiments in pure hydrogen capillary-arc and H2_{2}+Ar microwave discharges.Comment: REVTeX, 25 pages + 12 figures + 9 tables. Phys. Rev. E, eprint replaced because of resubmission to journal after referee's 2nd repor
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