We report rovibronic spectra of the $A{}^3\mathrm{\Sigma }^{+}(v^{\prime }=0\text{–}2)$–$X{}^3{\mathrm{\Pi }}_{\mathrm{\Omega }}(v=0)$ rovibronic transitions ($\left|\mathrm{\Omega }\right|=0$,1, and 2) of the ${\mathrm{CO}}^{2+}$ doublycharged molecular ion. Spectra were recorded at high resolution ($\sim 5 {\mathrm{cm}}^{-1}$) in a fast beam of ${\mathrm{CO}}^{2+}$ 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 $X{}^3{\mathrm{\Pi }}_{\mathrm{\Omega }}(v=0)$, but not the rotational structure of the bands due to spectral congestion, and provide spectroscopic information on ${\mathrm{CO}}^{2+}$ 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.

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• Interatomic & molecular potentials
• Molecular spectra
• Scattering of atoms, molecules, clusters & ions