High-Resolution Spectroscopy of the X-A Transition of the Carbon Monoxide Dication CO2+

Huet, X.;Aerts, A.;Vaeck, N.;Génévriez, Matthieu;Urbain, Xavier
(2026) Physical Review A — Vol. 113, n° 1, p. 1-28 (2026)

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  • Huet, X.orcid-logoSpectroscopy, Quantum Chemistry and Atmospheric Remote Sensing (SQUARES), Universit´e libre de Bruxelles, 50 Avenue F. Roosevelt, C.P. 160/09, B-1050 Brussels, Belgium
    Author
  • Aerts, A.orcid-logoSpectroscopy, Quantum Chemistry and Atmospheric Remote Sensing (SQUARES), Universit´e libre de Bruxelles, 50 Avenue F. Roosevelt, C.P. 160/09, B-1050 Brussels, Belgium
    Author
  • Vaeck, N.orcid-logoSpectroscopy, Quantum Chemistry and Atmospheric Remote Sensing (SQUARES), Universit´e libre de Bruxelles, 50 Avenue F. Roosevelt, C.P. 160/09, B-1050 Brussels, Belgium
    Author
  • Génévriez, Matthieuorcid-logoUCLouvain
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  • Urbain, Xavierorcid-logoUCLouvain
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Abstract
We report rovibronic spectra of the A 3Σ+(v′ = 0 − 2) - X 3ΠΩ(v = 0) rovibronic transitions (|Ω| = 0, 1 and 2) of the CO2+ doubly-charged molecular ion. Spectra were recorded at high resolution (∼ 5 cm−1) in a fast beam of CO2+ molecules by detecting the Coulomb explosion of the molecules upon excitation to the A state. Measurements were guided by ab initio calculations which then assisted the assignment of the observed spectral features. Our results resolve the spin-orbit splittings of the ground vibronic state X 3ΠΩ(v = 0), but not the rotational structure of the bands due to spectral congestion, and provide spectroscopic information on CO2+ with unprecedented resolution. In doing so they expand our knowledge of this benchmark doubly charged molecular ion and expand the short list of doubly charged molecules studied at high resolution.
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Huet, X., Aerts, A., Vaeck, N., Génévriez, M., & Urbain, X. (2026). High-Resolution Spectroscopy of the X-A Transition of the Carbon Monoxide Dication CO2+. Physical Review A, 113(1), 1-28. https://doi.org/10.1103/x1f1-445d (Original work published 2026)