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Hot-atom mechanism in photodesorption of molecular oxygen from a stepped platinum (113) surface

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タイトル: Hot-atom mechanism in photodesorption of molecular oxygen from a stepped platinum (113) surface
著者: Sano, M. 著作を一覧する
Ohno, Y. 著作を一覧する
Yamanaka, T. 著作を一覧する
Matsushima, T. 著作を一覧する
Quinay, E. B. 著作を一覧する
Jacobi, K. 著作を一覧する
発行日: 1998年 6月22日
出版者: American Institute of Physics
誌名: The Journal of Chemical Physics
巻: 108
号: 24
開始ページ: 10231
終了ページ: 10238
出版社 DOI: 10.1063/1.476483
抄録: The photodesorption of oxygen admolecules was studied on a stepped Pt(113) = (s)2(111) × (001) surface with 193 nm irradiation at 110 K. Multidirectional desorptions were found to collimate at ±12–20° and ±45–49° off the surface normal and also along the surface normal in a plane along the trough. The first component is always dominant, and the weak second component only appears at higher oxygen coverages. The normally directed desorption is not significant. The translational energy of desorbing O2 peaks around 15–20° and 50°, confirming the inclined desorptions. It is proposed that these inclined components are due to the desorption induced by the impact of oxygen admolecules with hot oxygen atoms from the photodissociation of adsorbed molecular oxygen, emitted along the trough. A simple cosine distribution was found to fit the thermal desorption from oxygen admolecules and also the recombinative desorption of oxygen adatoms. The 193 nm irradiation also produces additional, less tightly bound oxygen adatoms, which yield a desorption component collimated at 15° from the surface normal in the step-down direction
Rights: Copyright © 1998 American Institute of Physics
資料タイプ: article
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 松島 龍夫


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