Two New 2σ–2σ Systems Due to the Molecule No

The emission band system at 6000 Å found in discharges in flowing NO2 and attributed to NO+ by Jausserant, Grillet, and Duffieux has been examined at high dispersion and shown to be due to the transition of E2Σ+ (a new level) → A2Σ+ (the upper state of the γ system) of the NO molecule. The rotational and vibrational analysis of the system is given. The band system corresponding to the transition D2Σ+ (upper state of the ε system of NO) → A2Σ+ at 11,000 Å has also been observed and its analysis is presented. The separate nature of the D2Σ+ state from the A2Σ+ state is thus supported. Some brief remarks on other band structures found in discharges in flowing NO2 are included.