High-Resolution Spectroscopy of the X-A Transition of the Carbon Monoxide Dication CO$^{2+}$
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866915708126887936 |
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| author | Huet, X. Aerts, A. Vaeck, N. Génévriez, M. Urbain, X. |
| author_facet | Huet, X. Aerts, A. Vaeck, N. Génévriez, M. Urbain, X. |
| contents | We report rovibronic spectra of the A $^3Σ^+$($v'=0-2$) - X $^3Π_Ω(v=0)$ rovibronic transitions ($|Ω|=0, 1$ and 2) of the CO$^{2+}$ doubly-charged molecular ion. Spectra were recorded at high resolution ($\sim 5$~cm$^{-1}$) in a fast beam of CO$^{2+}$ molecules by detecting the Coulomb explosion of the molecules upon excitation to the A state. Measurements were guided by \textit{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 $^3Π_Ω(v=0)$, but not the rotational structure of the bands due to spectral congestion, and provide spectroscopic information on CO$^{2+}$ 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2601_01933 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | High-Resolution Spectroscopy of the X-A Transition of the Carbon Monoxide Dication CO$^{2+}$ Huet, X. Aerts, A. Vaeck, N. Génévriez, M. Urbain, X. Atomic Physics Quantum Physics We report rovibronic spectra of the A $^3Σ^+$($v'=0-2$) - X $^3Π_Ω(v=0)$ rovibronic transitions ($|Ω|=0, 1$ and 2) of the CO$^{2+}$ doubly-charged molecular ion. Spectra were recorded at high resolution ($\sim 5$~cm$^{-1}$) in a fast beam of CO$^{2+}$ molecules by detecting the Coulomb explosion of the molecules upon excitation to the A state. Measurements were guided by \textit{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 $^3Π_Ω(v=0)$, but not the rotational structure of the bands due to spectral congestion, and provide spectroscopic information on CO$^{2+}$ 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. |
| title | High-Resolution Spectroscopy of the X-A Transition of the Carbon Monoxide Dication CO$^{2+}$ |
| topic | Atomic Physics Quantum Physics |
| url | https://arxiv.org/abs/2601.01933 |