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Rapid progress in the experimental control and interrogation of molecules,combined with developments in precise calculations of their structure, areenabling new opportunities in the investigation of nuclear and particle physicsphenomena. Molecules containing heavy, octupole-deformed nuclei such as radiumare of particular interest for such studies, offering an enhanced sensitivityto the properties of fundamental particles and interactions. Here, we reportprecision laser spectroscopy measurements and theoretical calculations of thestructure of the radioactive radium monofluoride molecule, $^{225}$Ra$^{19}$F.Our results allow fine details of the short-range electron-nucleus interactionto be revealed, indicating the high sensitivity of this molecule to thedistribution of magnetization, currently a poorly constrained nuclear property,within the radium nucleus. These results provide a direct and stringent test ofthe description of the electronic wavefunction inside the nuclear volume,highlighting the suitability of these molecules to investigate subatomicphenomena.

Observation of the distribution of nuclear magnetization in a molecule