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Signatures of Quantum-Tunneling Diffusion of Hydrogen Atoms on Water Ice at 10 K

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Title: Signatures of Quantum-Tunneling Diffusion of Hydrogen Atoms on Water Ice at 10 K
Authors: Kuwahata, K. Browse this author
Hama, T. Browse this author
Kouchi, A. Browse this author
Watanabe, N. Browse this author
Issue Date: 24-Sep-2015
Publisher: American Physical Society
Journal Title: Physical review letters
Volume: 115
Issue: 13
Start Page: 133201
Publisher DOI: 10.1103/PhysRevLett.115.133201
PMID: 26451552
Abstract: Reported here is the first observation of the tunneling surface diffusion of a hydrogen (H) atom on water ice. Photostimulated desorption and resonance-enhanced multiphoton ionization methods were used to determine the diffusion rates at 10 Kon amorphous solid water and polycrystalline ice. H-atom diffusion on polycrystalline ice was 2 orders of magnitude faster than that of deuterium atoms, indicating the occurrence of tunneling diffusion. Whether diffusion is by tunneling or thermal hopping also depends on the diffusion length of the atoms and the morphology of the surface. Our findings contribute to a better understanding of elementary physicochemical processes of hydrogen on cosmic ice dust.
Rights: ©2015 American Physical Society
Type: article
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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