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Surface Temperature Dependence of Hydrogen Ortho-Para Conversion on Amorphous Solid Water

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Title: Surface Temperature Dependence of Hydrogen Ortho-Para Conversion on Amorphous Solid Water
Authors: Ueta, Hirokazu Browse this author
Watanabe, Naoki Browse this author →KAKEN DB
Hama, Tetsuya Browse this author
Kouchi, Akira Browse this author
Issue Date: 23-Jun-2016
Publisher: American Physical Society (APS)
Journal Title: Physical Review Letters
Volume: 116
Issue: 25
Start Page: 253201
Publisher DOI: 10.1103/PhysRevLett.116.253201
PMID: 27391719
Abstract: The surface temperature dependence of the ortho-to-para conversion of H-2 on amorphous solid water is first reported. A combination of photostimulated desorption and resonance-enhanced multiphoton ionization techniques allowed us to sensitively probe the conversion on the surface of amorphous solid water at temperatures of 9.2-16 K. Within a narrow temperature window of 8 K, the conversion time steeply varied from similar to 4.1 x 10(3) to similar to 6.4 x 10(2) s. The observed temperature dependence is discussed in the context of previously suggested models and the energy dissipation process. The two-phonon process most likely dominates the conversion rate at low temperatures.
Rights: ©2016 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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