Nature of the resonant states of NO−

The stabilization method of Taylor has been used to calculate the nature of the states of NO^? corresponding to the lowest resonances observed recently by Sanche and Schulz. It is confirmed that they consist of two Rydberg electrons in the core of the X ¹Σ⁺ ground state of the ion. The proposed assignments are the (Rsσ)²¹Σ⁺, (Rsσ)(Rpπ) ³Π, (Rsσ)(Rpσ) ³Σ⁺ states. The fourth resonance is attributed to an (Rpπ)²³Σ⁺ state. The Rydberg or of these states of the negative ion are more diffuse than the corresponding ones of the neutral molecule.