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We report the spectroscopy of 11 electronic states in the radioactivemolecule radium monofluoride (RaF). The observed excitation energies arecompared with state-of-the-art relativistic Fock-space coupled cluster (FS-RCC)calculations, which achieve an agreement of >99.71% (within ~8 meV) for allstates. High-order electron correlation and quantum electrodynamics correctionsare found to be important at all energies. Establishing the accuracy ofcalculations is an important step towards high-precision studies of thesemolecules, which are proposed for sensitive searches of physics beyond theStandard Model.

Pinning down electron correlations in RaF via spectroscopy of excited states