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

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Title: Hot-atom mechanism in photodesorption of molecular oxygen from a stepped platinum (113) surface
Authors: Sano, M. Browse this author
Ohno, Y. Browse this author
Yamanaka, T. Browse this author
Matsushima, T. Browse this author
Quinay, E. B. Browse this author
Jacobi, K. Browse this author
Issue Date: 22-Jun-1998
Publisher: American Institute of Physics
Journal Title: The Journal of Chemical Physics
Volume: 108
Issue: 24
Start Page: 10231
End Page: 10238
Publisher DOI: 10.1063/1.476483
Abstract: 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
Type: article
Appears in Collections:触媒科学研究所 (Institute for Catalysis) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 松島 龍夫

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