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Updated: Feb 26, 2026

Assessment of Boron Doped Diamond Electrode Quality and Application to In Situ Modification of Local pH by Water Electrolysis
Published on: January 6, 2016
Nonadiabatic Kohn Anomaly in Heavily Boron-Doped Diamond
Fabio Caruso1,2, Moritz Hoesch3, Philipp Achatz4
1Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, United Kingdom.
Abstract:
We report evidence of a nonadiabatic Kohn anomaly in boron-doped diamond, using a joint theoretical and experimental analysis of the phonon dispersion relations. We demonstrate that standard calculations of phonons using density-functional perturbation theory are unable to reproduce the dispersion relations of the high-energy phonons measured by high-resolution inelastic x-ray scattering. On the contrary, by taking into account nonadiabatic effects within a many-body field-theoretic framework, we obtain excellent agreement with our experimental data. This result indicates a breakdown of the Born-Oppenheimer approximation in the phonon dispersion relations of boron-doped diamond.
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