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Direct Determination of the Activation Energy for Diffusion of OH Radicals on Water Ice

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Title: Direct Determination of the Activation Energy for Diffusion of OH Radicals on Water Ice
Authors: Miyazaki, A. Browse this author
Tsuge, M. Browse this author
Hidaka, H. Browse this author
Nakai, Y. Browse this author
Watanabe, N. Browse this author →KAKEN DB
Issue Date: 14-Nov-2022
Publisher: American Astronomical Society
Journal Title: The Astrophysical journal letters
Volume: 940
Start Page: L2
Publisher DOI: 10.3847/2041-8213/ac9d30
Abstract: Using a combination of photostimulated desorption and resonance-enhanced multiphoton ionization methods, the behaviors of OH radicals on the surface of an interstellar ice analog were monitored at temperatures between 54 and 80 K. The OH number density on the surface of ultraviolet-irradiated compact amorphous solid water gradually decreased at temperatures above 60 K. Analyzing the temperature dependence of OH intensities with the Arrhenius equation, the decrease can be explained by the recombination of two OH radicals, which is rate-limited by thermal diffusion of OH. The activation energy for surface diffusion was experimentally determined for the first time to be 0.14 +/- 0.01 eV, which is larger than or equivalent to those assumed in theoretical models. This value implies that the diffusive reaction of OH radicals starts to be activated at approximately 36 K on interstellar ice.
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)

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