Low-energy inelastic electron scattering from carbon monoxide: Excitation and de-excitation of the X¹Σ⁺, a³Π, a^′3Σ⁺, A¹Π, d³Δ, e³Σ⁻, I¹Σ⁻ and D¹Δ electronic states

Cross-sections for electronic excitation and de-excitation among the ground state and lowest-lying seven electronic excited states of carbon monoxide (CO) by low-energy electron impact are computed using the R-matrix method. The excitation cross-sections from the ground state to the electronic states a³Π, a^′3Σ⁺ and A¹Π agree with previous experimental and theoretical results. In addition, the cross-sections for the I¹Σ⁻ and D¹Δ states of CO, which will cascade to CO a^′3Σ⁺ and A¹Π states, are calculated. Furthermore, in contrast to the typical increase in electronic excitation cross-sections with collision energy, the de-excitation cross-sections show a negative trend with increasing energy.