Where are Protons and Deuterons in KH_pD_{1-p}CO_3? A Neutron Diffraction Study

Details Where are Protons and Deuterons in KH_pD_{1-p}CO_3? A Neutron Diffraction Study Where are Protons and Deuterons in KH_pD_{1-p}CO_3? A Neutron Diffraction Study

2009-03-24

arxiv.org/abs/0903.4032v1

Zeitschrift fuer Physikalische Chemie 222, 8-9 (2008) 1279-1290

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

10.1524/zpch.2008.5388

The crystals of potassium hydrogen carbonate (KHCO3) and the KDCO3 analogue are isomorphous. They are composed of hydrogen or deuterium bonded centrosymmetric dimers (HCO3-)(2) or (DCO3-)(2). The space group symmetry of KHpD1-pCO3 (p approximate to 0.75) determined with neutron diffraction is identical to those of KHCO3 and KDCO3. 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.

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