TWO NEW 2Σ–2Σ SYSTEMS DUE TO THE MOLECULE NO

Abstract

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.