Energy dependence of rotational and vibrational distributions of N2(C) for the Ar*(3P0,2) + N2(X) excitation transfer reaction

Vliembergen, E.J.W. van; Vredenbregt, E.J.D.; Kaashoek, G.H.; Jaspar, J.P.M.J.; Lanen, M.M.M. van; Janssens, M.F.M.; Verheyen, M.J.; Beijerinck, H.C.W.

doi:10.1016/0301-0104(87)80025-3

Cited by 21 publications

(1 citation statement)

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“…There exist examples for the excitation transfer from metastable atoms in which, due to the energy constraint (the electronic + vibrational energy of the product slightly higher than the energy of the metastable state), the rotational temperature of the nascent distribution is lower than the gas temperature. Amongst them, one can cite N 2 (B, ν = 5) produced by energy transfer from Xe( 3 P 2 ) metastable atom to N 2 [44,46,47] and N 2 (C, ν = 3) produced by energy transfer from Ar( 3 P 2 ) metastable atoms to N 2 [50].…”

Section: Excitation (And Ionization) Processesmentioning

confidence: 99%

Gas temperature determination from rotational lines in non-equilibrium plasmas: a review

Bruggeman

Sadeghi

Schram

et al. 2014

Plasma Sources Sci. Technol.

435

431

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The gas temperature in non-equilibrium plasmas is often obtained from the plasma-induced emission by measuring the rotational temperature of a diatomic molecule in its excited state. This is motivated by both tradition and the availability of low budget spectrometers. However, non-thermal plasmas do not automatically guarantee that the rotational distribution in the monitored vibrational level of the diatomic molecule is in equilibrium with the translational (gas) temperature. Often non-Boltzmann rotational molecular spectra are found in non-equilibrium plasmas. The deduction of a gas temperature from these non-thermal distributions must be done with care as clearly the equilibrium between translational and rotational degrees of freedom cannot be achieved. In this contribution different methods and approaches to determine the gas temperature are evaluated and discussed. A detailed analysis of the gas temperature determination from rotational spectra is performed. The physical and chemical background of non-equilibrium rotational population distributions in molecular spectra is discussed and a large range of conditions for which non-equilibrium occurs are identified. Fitting procedures which are used to fit (non-equilibrium) rotational distributions are analyzed in detail. Lastly, recommendations concerning the conditions for which the gas temperatures can be obtained from diatomic spectra are formulated.

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