Potential-Energy Curves for CO and CO+

Abstract

Potential‐energy curves for the X ¹Σ⁺, A ¹Π, I ¹Σ⁻, a ³Π, a′ ³Σ⁺, d ³Δ_i, and e ³Σ⁻ electronic states of CO and the X ²Σ⁺, A ²Π_i, and B ²Σ⁺ electronic states of CO⁺ have been calculated using a modification of the Rydberg—Klein—Rees method. The curves for the a ³Π, d ³Δ_i, and A ²Π_i states, which are intermediate between Hund's Cases (a) and (b), represent fictitious rotationless states calculated using the true B_v. Benesch and co‐workers have shown theoretically that this representation is correct for such intermediate cases. The numerical results for the A ²Π_i state presented here confirm their conclusions.