The transfer of protons across a high barrier only occasionally occurs through quantum-mechanical tunnelling. Low-temperature scanning tunnelling microscopy shows concerted tunnelling of four protons within chiral cyclic water tetramers supported on an inert surface.
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Drechsel-Grau, C., Marx, D. Protons in concert. Nature Phys 11, 216–218 (2015). https://doi.org/10.1038/nphys3269
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DOI: https://doi.org/10.1038/nphys3269
