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The crystals of potassium hydrogen carbonate (KHCO 3 ) and the KDCO 3  analogue are isomorphous. They are composed of hydrogen or deuterium bonded centrosymmetric dimers (HCO 3  – ) 2  or (DCO 3  – ) 2 . The space group symmetry of KH  p  D 1  –   p  CO 3  ( p  ≈ 0.75) determined with neutron diffraction is identical to those of KHCO 3  and KDCO 3 . This is at variance with a random distribution of H and D nuclei. These crystals are macroscopic quantum systems in which protons or/and deuterons merge into macroscopic states.

Where are Protons and Deuterons in KH p D 1 – p CO 3 ? A Neutron Diffraction Study