Abstract
Fixed-nuclei \(\mathbf {R}\)-matrix calculations are performed at the equilibrium geometry of carbon monoxide using the very large cc-pV6Z Gaussian basis set. Results from a close-coupling model involving 27 low-lying target states indicate the presence of three \(^2\varSigma ^+\) resonances at 10.1 eV (width 0.1 eV), 10.38 eV (0.0005 eV), and 11.15 eV (0.005 eV), a \(^2\varDelta \) resonance at 13.3 eV (0.1 eV) and two \(^2\varPi \) resonances at 1.9 eV (1.3 eV) and 12.8 eV (0.1 eV). These new results are in very good agreement with many experimental studies but in contrast to a previous calculation using a smaller cc-pVTZ basis set where we found only one \(^2\varSigma ^+\) resonances at 12.9 eV. This is the first time that any theoretical study has reported these high lying \(^2\varSigma ^+\) resonances in agreement to experiment and reported detection of a \(^2\varDelta \) resonance. Total, elastic and electronic excitation cross sections of CO by electron impact are also presented.
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AD gratefully acknowledges UCL for the use of its computational resources.
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Dora, A., Tennyson, J. (2019). Electron Collisions with CO Molecule: An R-Matrix Study Using a Large Basis Set. In: Deshmukh, P., Krishnakumar, E., Fritzsche, S., Krishnamurthy, M., Majumder, S. (eds) Quantum Collisions and Confinement of Atomic and Molecular Species, and Photons. Springer Proceedings in Physics, vol 230. Springer, Singapore. https://doi.org/10.1007/978-981-13-9969-5_3
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