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                <title xml:lang="en">Rotational temperatures of N2(C,0) and OH(A,0) as gas temperature estimates in the middle pressure Ar/O2 discharge</title>
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              <p>Radiative transitions N 2 (C-B, 0-0) and OH(A-X, 0-0) were used in order to estimate rotational temperatures of N 2 (C, 0) and OH(A, 0) in the middle pressure Ar / 0.5% O 2 RF discharge. N 2 (C, 0) and OH(A, 0) rotational temperature dependence on power density was determined and quenching / rotational relaxation frequencies of N 2 (C, 0) and OH(A, 0) was calculated. It was found that at our conditions rotational temperature of OH(A, 0) can be used for estimation of gas temperature while N 2 (C, 0) rotational temperature overestimates the gas temperature. Classification numbers (PACS): 52.70.Kz, 52.80.Pi Submitted to Journal of Physics D: Applied Physics 1. Introduction Many plasma characteristics depend on the gas (translational) temperature, T G. There are several T G estimation methods e.g. by using pressure rise in closed systems due to temperature rise, by using thermocouples, spectral methods [ 1 ] etc. The gas temperature is frequently estimated on the basis of rotational temperature, T Rot, of some molecules M* (e.g. N 2, N 2 +, OH, O 2, CO, CH etc. [ 2, 3]). However, this is possible only when some main conditions are fulfilled. First of all, the population of rotational states should follow the Boltzmann distribution. Besides, one of the next cases should be valid: (1) the initial rotational population distribution (i.e. distribution just after the excitation) of M* corresponds to that equilibrium with T G (hereafter: thermalized distribution). For example reaction,</p>
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