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Updated: Jun 3, 2026

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
Published on: July 19, 2019
Evidence of macroscopically entangled protons in a mixed isotope crystal of KH(p)D(1-p)CO3
François Fillaux1, Alain Cousson, Matthias J Gutmann
1LADIR-CNRS, UMR 7075, Université Pierre et Marie Curie, Thiais, France. fillaux@glvt-cnrs.fr
Abstract:
We examine whether protons and deuterons in a crystal of KH(0.76)D(0.24)CO(3) at 300 K are particles or matter waves. The neutron scattering function measured over a broad range of reciprocal space reveals the enhanced diffraction pattern anticipated for antisymmetrized macroscopic states for protons (fermions). These features exclude a statistical distribution of protons and deuterons. Raman spectra are consistent with a mixture of KHCO(3) and KDCO(3) sublattices whose isomorphous structures are independent of the isotope content. We propose a theoretical framework for decoherence-free proton and deuteron states.
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