Band spectra of the first positive (1PS) and the second positive (2PS) systems of nitrogen molecule are analyzed
with optical emission spectroscopy (OES) measurement when N2 gas is puffed onto the Ar plasma jet. It is found
that Tv ≃ Tr ≃ 0.17 eV for C state, while Tv ≃ 0.28 - 0.35 eV, and Tr ≃ 0.038 - 0.050 eV for B state, all of
which are determined by fitting the theoretically calculated spectrum with those measured experimentally. Since
the electron temperature in the observed area is about 0.4 eV, it is naturally considered that the N2 C states
are mainly 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 Ar gas temperature.
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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