Transition Energies and Line Oscillator Strengths of the C ²Π(0)-X ²Π(0–6) Absorption Bands of Nitric Oxide. A Theoretical Study

Abstract

Theoretical absorption oscillator strengths and wavelengths for rotational transitions of the C 2Π(v′ = 0)-X 2Π(v″) bands with v″ = 0–6 of nitric oxide are reported. The Molecular Quantum Defect Orbital method has been used in the calculations and the known interaction between the C 2Π(v = 0) Rydberg and the B 2Π (v = 7) valence states has been dealt with through an appropriate rovibronic energy matrix. We hope that the reported data may be useful in the analysis of the observed ultraviolet nightglow emission from nitric oxide in the upper atmospheres of Earth, Venus, and Mars.

Absorption Line Oscillator Strengths for the C 2Π(0)-A 2Σ+(0) Band of Nitric Oxide

“…As the potential curves show, the lower state of the interacts with the B 2 Π(7) valence state according to earlier studies on perturbations of excited states of the NO molecule (Lagerqvist & Miecher 1958;Amiot & Verges 1982). In a previous work (Lavín & Velasco 2022), we used the method of matrix diagonalization to treat the homogeneous interaction between the two doublet components of the…”

“…The MQDO method has been employed to calculate the electronic transition moment. Very recently, we obtained satisfactory results of rovibronic oscillator strengths for bands belonging to the δ(C 2 Π-X 2 Π) system of NO by applying this procedure (Lavín & Velasco 2022).…”