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

• Ueta, Hirokazu

• Watanabe, Naoki

• Hama, Tetsuya

• Kouchi, Akira

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.

Journal

• Physical Review Letters

  Physical Review Letters 116 (25), 253201-, 2016-06-23

  American Physical Society (APS)

Keywords

• General Physics and Astronomy

Details

• CRID: 1050845763950722176
• NII Article ID: 120005828466
• DOI: 10.1103/physrevlett.116.253201
• ISSN: 10797114
• ISSN: 00319007
• HANDLE: 2115/62697
• Web Site: http://link.aps.org/article/10.1103/PhysRevLett.116.253201
• Web Site: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevLett.116.253201/fulltext
• Text Lang: en
• Article Type: journal article
• Data Source:
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  • CiNii Articles
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