Abstract
The population distributions over the rotational levels of excitede 3 Σ + u ,v′=1,2,3 andd 3 Π + u v′=0, 2;d 3 Π − u ,v′=0, 2, 3;k 3 Π − u ,v′=0, 1 andD 1 Π − u ,v′=0, 1 electronic-vibrational states of the hydrogen molecule have been obtained in low-pressure plasma of capillary arc discharge, by measuring certain emission band intensities. For the bands starting from thee 3 Σ + u andd 3 Π + u states distorted due to regular perturbations the semiempirically determined transition probabilities have been used. It is shown that simple excitation models (based on the assumptions of the direct electron impact excitation and the independence of the effective mean lifetime of the excited molecules on the rotational quantum number) are applicable fairly well in investigated plasma. In particular the values of the gas temperature given by different bands coincide within the experimental errors. Therefore it is possible to determine the gas temperature in these non-equilibrium conditions with an acceptable accuracy (better than 5÷7%).
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Dedicated to Prof. I. Kovács on his 70th birthday
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Lavrov, B.P., Tyutchev, M.V. Gas temperature measurements in non-equilibrium plasma from the intensities of H2 molecular bands. Acta Physica Hungarica 55, 411–426 (1984). https://doi.org/10.1007/BF03155952
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DOI: https://doi.org/10.1007/BF03155952