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Ultraviolet-photon exposure stimulates negative current conductivity in amorphous ice below 50 K

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Title: Ultraviolet-photon exposure stimulates negative current conductivity in amorphous ice below 50 K
Authors: Watanabe, N. Browse this author →KAKEN DB
Sameera, W. M. C. Browse this author →KAKEN DB
Hidaka, H. Browse this author
Miyazaki, A. Browse this author
Kouchi, A. Browse this author →KAKEN DB
Issue Date: 16-Dec-2019
Publisher: Elsevier
Journal Title: Chemical physics letters
Volume: 737
Start Page: 136820
Publisher DOI: 10.1016/j.cplett.2019.136820
Abstract: Water ice is known to carry positive charge via transfer of excess protons through a hydrogen-bonded system. In contrast, constant negative charge conductivity in ice has neither been confirmed experimentally nor theoretically. Here, we report that ultraviolet-photon irradiation stimulates negative current conductivity in amorphous ice at temperatures below 50 K, where hitherto known proton transfer from the surface through the bulk ice is inhibited. Quantum chemical calculations imply that the negative current conductivity results from almost barrier-less proton-hole transfer processes that neither requires intrinsic defects, doped species, nor reorientation of H2O molecules in ice.
Rights: ©2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 渡部 直樹

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