We present a model that describes the departure from equilibrium of the OH(A) rotational level distribution in collisional plasmas. In this model, the OH(A) rotational state densities are governed by a rate equation including: (i) a balanced rotational energy transfer process with the buffer gas species; (ii) unbalanced exothermic reactions, which pump rotationally excited states into the system. Based on the prior assumptions, we formally derive a model function describing the non-Boltzmann distribution. This function depends on five parameters, each of which has a physical meaning. The temperature is given as one of the model function parameters, which can be readily identified with the translational temperature of the buffer gas. The validity of the model was tested by means of the least-squares fitting of data found in literature. Based on this analysis we propose the formation processes of rotationally excited OH(A) in several discharge conditions.
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| http://dx.doi.org/10.1103/PhysRevE.99.033202 | DOI Listing |
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