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D abstraction by H at a D-saturated Ru(001) surface
http://hdl.handle.net/10228/2874
http://hdl.handle.net/10228/287448a7eb69-1076-4b44-a9ae-4c01483e3840
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
SS2333.pdf (731.5 kB)
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| アイテムタイプ | 学術雑誌論文 = Journal Article(1) | |||||
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| 公開日 | 2009-12-10 | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | journal article | |||||
| タイトル | ||||||
| タイトル | D abstraction by H at a D-saturated Ru(001) surface | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 著者 |
Yamauchi, T
× Yamauchi, T× Nakashima, Y× Misumi, T× Mine, K× 並木, 章 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | D abstraction (ABS) by H at Ru(0 0 1) surfaces initially saturated with D adatoms has been investigated using in situ mass spectrometry. HD and D2 desorption rates are measured at various surface temperatures T as a function of H exposure time. Yield of D2 desorption increases with T, while that of HD is little affected. Analyzing the measured rate curves, HD and D2 desorption orders are evaluated to be 1.7 ± 0.1 and 2.5 ± 0.1, respectively, with respect to D coverage θD. To pursue the origin of the derived non-integral reaction orders the rate curves are further analyzed with the rate equations constructed to involve several ABS channels. Consequently, we find that the HD desorption is mainly governed by a second-order rate law in θD rather than the conventional hot atom-mediated ABS reaction even when it is corrected to include an isotope effect on ABS. We argue that such second-order ABS kinetics becomes important when the H atoms in excited state of chemisorption have energetically relaxed to some extent, and thereby tend to reside at, e.g. hexagonal closed packed hollow sites, interacting with nearby adatoms. On the other hand, the D2 rate curves can be fit with third-order kinetics, consistent with the Langmuir–Hinshelwood mechanism in a super-saturation state. The isotope effect plays an essential role in the ABS reaction of D abstraction by H which competes with H abstraction by H as D adatoms are replaced by H atoms. | |||||
| 書誌情報 |
Surface Science 巻 603, 号 15, p. 2333-2339, 発行日 2009 |
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| 出版社 | ||||||
| 出版者 | Elsevier | |||||
| DOI | ||||||
| 関連タイプ | isVersionOf | |||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | https://doi.org/10.1016/j.susc.2009.05.013 | |||||
| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 0169-4332 | |||||
| 著作権関連情報 | ||||||
| 権利情報 | Crown copyright © 2009 Published by Elsevier B.V. | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | Hydrogen | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | Abstraction reaction | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | Ruthenium | |||||
| 出版タイプ | ||||||
| 出版タイプ | AM | |||||
| 出版タイプResource | http://purl.org/coar/version/c_ab4af688f83e57aa | |||||
| 査読の有無 | ||||||
| 値 | yes | |||||
| 業績ID | ||||||
| 値 | 912CD5927E941CAB49257688003A9188 | |||||
| 情報源 | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | http://www.sciencedirect.com/science/journal/01694332 | |||||
| 関連名称 | http://www.sciencedirect.com/science/journal/01694332 | |||||
