DC glow discharge was used to study N2 molecule at low pressure (4 Torr). The emission spectrum was examined in the range of 320-470 nm in the discharge plasma of N2, which showed that the emission was composed of a series of spectral lines equidistant, and the relative emission intensity became weaker with longer wavelength, whose distribution accorded with Frank-Condon rule. It is attributed to the transition of C 3pi(u)-->B3pi(g). On this base, the authors have calculated the vibrational frequency of B 3pig state to be 1738.50 cm(-1). The Frank-Condon factor about C3pi(u) (v' = 0)-->B3H(g) (v" = 0-5) was calculated, which is consistent with the results of experiment.
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