We analyzed the N2 first positive (1PS) and the second positive (2PS) systems by optical emission spectroscopy (OES) when N2 gas is puffed onto Ar plasma jet. We found that Tv ~ Tr ~ 0.17 eV for C state, while Tv ~ 0.28 – 0.35 eV, Tr ~ 0.038 – 0.050 eV for B state, all of which are determined by fitting the calculated spectrum with those measured experimentally. Since the electron temperature in the observed area is about 0.4 eV, the N2 C states are produced by the resonant energy transfer from the Ar metastable to the N2 ground state. It is also considered that similar values of Tv and Tr of the C state are the approximate value of the translational temperature of the metastable Ar. Meanwhile, the vibrational distribution of the B state shows that the B state is populated not only by the radiative decay of the C state but also from other collisional
processes, since the Franck-Condon principle cannot predict the vibrational population of the B state from the C state.
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