Su, He; Tennyson, Jonathan; Zhang, Hong; Cheng, Xinlu; Fan, Qunchao; Yan, Yangjun; (2025) Low-energy electron scattering on CN radical over a range of internuclear separations. Physica Scripta , 100 (7) , Article 075413. 10.1088/1402-4896/adea22.

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Abstract

Low-energy electron scattering calculations on the open-shell CN radical are performed using the fixed-nucleus R-matrix method for several internuclear separations (R). The elastic, momentum transfer, differential and electronic excitation cross section are presented at various target and scattering models. We report five CN− core-excited shape resonances lying above the first electronic excitation threshold, namely 3Σ+, 1 3Π, 2 3Π, 3Σ− and 1Σ−. The CN− resonance curves are analyzed as a function of R, confirming that the resonances become narrower with increasing R and in general their energies drop; the 3Σ+ resonance becomes bound for R > 1.3918 Å. The designation of these resonances are discussed. By the analysis of changing R, the difference on the magnitude of cross sections is prominent happening at the peak positions. The results obtained here provide a starting point for studies of electron-impact resonant vibration excitation and other CN− resonance-driven phenomena in plasma.

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