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Higher lying resonances in low-energy electron scattering with carbon monoxide

Dora, A; Tennyson, J; Chakrabarti, K; (2016) Higher lying resonances in low-energy electron scattering with carbon monoxide. European Physical Journal D , 70 (10) 10.1140/epjd/e2016-70124-7. Green open access

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Abstract

R-matrix calculations on electron collisions with CO are reported whose aim is to identify any higher-lying resonances above the well-reported and lowest 2Π resonance at about 1.6 eV. Extensive tests with respect to basis sets, target models and scattering models are performed. The final results are reported for the larger cc-pVTZ basis set using a 50 state close-coupling (CC) calculation. The Breit-Wigner eigenphase sum and the time-delay methods are used to detect and fit any resonances. Both these methods find a very narrow 2Σ+ symmetry Feshbach-type resonance very close to the target excitation threshold of the b 3Σ+ state which lies at 12.9 eV in the calculations. This resonance is seen in the CC calculation using cc-pVTZ basis set while a CC calculation using the cc-pVDZ basis set does not produce this feature. The electronic structure of CO− is analysed in the asymptotic region; 45 molecular states are found to correlate with states dissociating to an anion and an atom. Electronic structure calculations are used to study the behaviour of these states at large internuclear separation. Quantitative results for the total, elastic and electronic excitation cross sections are also presented. The significance of these results for models of the observed dissociative electron attachment of CO in the 10 eV region is discussed.

Type: Article
Title: Higher lying resonances in low-energy electron scattering with carbon monoxide
Open access status: An open access version is available from UCL Discovery
DOI: 10.1140/epjd/e2016-70124-7
Publisher version: http://dx.doi.org/10.1140/epjd/e2016-70124-7
Language: English
Additional information: © The Author(s) 2016 This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Keywords: Science & Technology, Physical Sciences, Optics, Physics, Atomic, Molecular & Chemical, Physics, R-MATRIX METHOD, DIFFERENTIAL CROSS-SECTIONS, TIME-DELAY MATRIX, IMPACT EXCITATION, INTERMEDIATE ENERGIES, RYDBERG STATES, DISSOCIATIVE ATTACHMENT, MOLECULE-SCATTERING, NEAR-THRESHOLD, NEGATIVE-IONS
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery-pp.ucl.ac.uk/id/eprint/1521303
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