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- W2032964131 abstract "The vibrational distribution function (VDF) of the N2(C 3Πu, v′ = 0–4) state is analysed using optical emission spectroscopy in a nitrogen–argon (0–95% Ar) plasma sustained at a pressure of 400 Pa. A helical cavity is used as the plasma source with an excitation frequency of 27 MHz and power of 28 W. In the case of a pure nitrogen discharge, the N2(C 3Πu) VDF is roughly assimilated to the Boltzmann law and constant vibrational temperatures along the cavity axis of about 6000 ± 1000 K are calculated. With increasing Ar amount, the levels v′ = 1, 3 and 4 become overpopulated, implying that the excitation processes change with respect to pure nitrogen. A model based on the main known mechanisms is developed to reproduce the shape of the experimental VDF. The strong deviations observed with respect to a vibrational distribution following the Boltzmann law allow us to discuss the state-to-state excitation coefficients of a pooling reaction involving two molecules. In fact, this reaction is known to produce some vibrational levels of the N2(C 3Πu) state with greater efficiency, particularly the v′ = 1 level. Consequently, the pooling reaction is the main production process of the N2(C 3Πu) species in the discharge containing high argon percentages. A comparison between model and experimental data confirms the important role of electron and metastable species in the presented discharge." @default.
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- W2032964131 date "2012-01-01" @default.
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- W2032964131 title "Spectroscopic diagnostics and modelling of N2-Ar mixture discharge created by a RF helical coupling device - II. Vibrational distribution of N2(C3Πu, v') state" @default.
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