WEKO3
アイテム
Substantially low desorption barriers in recombinative desorption of deuterium from a Si(100) surface
http://hdl.handle.net/10228/2503
http://hdl.handle.net/10228/2503a2480bb9-bb04-48ce-86eb-24eebbc4ada7
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
Substantially.pdf (2.1 MB)
|
|
| アイテムタイプ | 学術雑誌論文 = Journal Article(1) | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 公開日 | 2009-09-29 | |||||||||||||
| 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 | Substantially low desorption barriers in recombinative desorption of deuterium from a Si(100) surface | |||||||||||||
| 言語 | en | |||||||||||||
| 言語 | ||||||||||||||
| 言語 | eng | |||||||||||||
| 著者 |
Narita, Y
× Narita, Y× Kihara, Y× Inanaga, S× 並木, 章
WEKO
219
|
|||||||||||||
| 抄録 | ||||||||||||||
| 内容記述タイプ | Abstract | |||||||||||||
| 内容記述 | We have studied desorption kinetics of deuterium molecules from a Si(1 0 0) surface by means of temperature-programmed desorption (TPD) spectra and isothermal desorptions. Three desorption components, denoted as β1,A,β1,B, and C, can be distinguished in semi-logarithmic plots of the TPD spectra. Their peak positions and intensities are strongly affected by the surface preparation methods employed, either with or without annealing to control the initial D coverage θOD . Peak C appears at the leading edge of the TPD peak. It accounts for only about 5% of the TPD peak at θOD = 1ML and it diminishes rapidly with decreasing θOD, vanishing at θOD = 0.5ML. In contrast, together the β1,A and β1,B peaks account for the whole TPD peak at any θOD less than 1.0 ML. The maximum of the β1,A peak is nearly constant at around the maximum temperature of the TPD peak. On the other hand, the β1,B peak appears on the high-temperature side of the TPD peak and it systematically shifts to higher temperatures with decreasing θOD. These results imply that first- and second-order kinetics are operating for the β1,A and β1,B desorptions, respectively. Isothermal desorption experiments confirm the above predicted kinetics for a limited region, namely θOD < 0.5ML. From the results for the rate curve analysis, the desorption barriers are evaluated to be 1.6 ± 0.1 eV and 1.8 ± 0.1 eV for the β1,A and β1,B desorptions, respectively. These values are substantially lower than the widely accepted value of ∼2.5 eV. To reproduce the measured TPD spectra we take the Arrhenius-type rate equation containing the first- and second-order rate terms for the β1,A and β1,B desorptions. The TPD spectra measured for θOD < 0.4ML can be reasonably fit with the proposed rate equation when the values given above for Ed,A and Ed,B are used. For θOD < 0.4ML, however, the TPD curves are not fit with the same values; rather, the best-fit curves require values for Ed,A and Ed,B larger than those given above. Combining the present kinetics results with those obtained by STM along with the studies, the β1,A and β1,B peaks may be attributed to desorption along the 2H path, while peak C may be attributed to desorption along the 4H path. The atomistic desorption mechanism as well as the energy relationship between the desorption barrier and isosteric heat of adsorption are discussed. | |||||||||||||
| 言語 | en | |||||||||||||
| 書誌情報 |
en : Surface Science 巻 603, 号 9, p. 1168-1174, 発行日 2009-05-01 |
|||||||||||||
| 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.2009.01.038 | |||||||||||||
| ISSN | ||||||||||||||
| 収録物識別子タイプ | PISSN | |||||||||||||
| 収録物識別子 | 0039-6028 | |||||||||||||
| ISSN | ||||||||||||||
| 収録物識別子タイプ | EISSN | |||||||||||||
| 収録物識別子 | 1879-2758 | |||||||||||||
| 著作権関連情報 | ||||||||||||||
| 権利情報 | Copyright © 2009 Elsevier B.V. All rights reserved. | |||||||||||||
| キーワード | ||||||||||||||
| 主題Scheme | Other | |||||||||||||
| 主題 | Si(1 0 0) | |||||||||||||
| キーワード | ||||||||||||||
| 主題Scheme | Other | |||||||||||||
| 主題 | Hydrogen | |||||||||||||
| キーワード | ||||||||||||||
| 主題Scheme | Other | |||||||||||||
| 主題 | Desorption barrier | |||||||||||||
| キーワード | ||||||||||||||
| 主題Scheme | Other | |||||||||||||
| 主題 | Temperature-programmed desorption | |||||||||||||
| キーワード | ||||||||||||||
| 主題Scheme | Other | |||||||||||||
| 主題 | Isothermal desorption | |||||||||||||
| 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 | 84E11DB570849A994925764000103A06 | |||||||||||||
