Isotopic Fingerprints of Proton-mediated Dielectric Relaxation in Solid and Liquid Water
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| Format: | Preprint |
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2025
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| author | Ryzhov, Alexander Kapralov, Pavel Stolov, Mikhail Andreev, Anton Radenovic, Aleksandra Freger, Viatcheslav Artemov, Vasily |
| author_facet | Ryzhov, Alexander Kapralov, Pavel Stolov, Mikhail Andreev, Anton Radenovic, Aleksandra Freger, Viatcheslav Artemov, Vasily |
| contents | We report cross-validated measurements of the isotope effect on dielectric relaxation for four isotopologues of ice and water, including the 1-10^5 Hz region, in which only sporadic and inconsistent measurements were previously available. In ice, the relaxation rates exhibit an activated temperature dependence with an isotope-independent activation energy. Across 248-273 K, the H_2O/D_2O relaxation rate ratio remains constant at 2.0 \pm 0.1. This scaling agrees with Kramers' theory in the high-friction limit if the moving mass is the proton or deuteron, indicating that dielectric relaxation is governed by a classic proton transfer over an energy barrier rather than molecular reorientation. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_09462 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Isotopic Fingerprints of Proton-mediated Dielectric Relaxation in Solid and Liquid Water Ryzhov, Alexander Kapralov, Pavel Stolov, Mikhail Andreev, Anton Radenovic, Aleksandra Freger, Viatcheslav Artemov, Vasily Chemical Physics Soft Condensed Matter We report cross-validated measurements of the isotope effect on dielectric relaxation for four isotopologues of ice and water, including the 1-10^5 Hz region, in which only sporadic and inconsistent measurements were previously available. In ice, the relaxation rates exhibit an activated temperature dependence with an isotope-independent activation energy. Across 248-273 K, the H_2O/D_2O relaxation rate ratio remains constant at 2.0 \pm 0.1. This scaling agrees with Kramers' theory in the high-friction limit if the moving mass is the proton or deuteron, indicating that dielectric relaxation is governed by a classic proton transfer over an energy barrier rather than molecular reorientation. |
| title | Isotopic Fingerprints of Proton-mediated Dielectric Relaxation in Solid and Liquid Water |
| topic | Chemical Physics Soft Condensed Matter |
| url | https://arxiv.org/abs/2509.09462 |