Tunneling Effect of O₂ in Dissociative Adsorption on Pt(111) Surface

• Shimizu Koji

  Department of Applied Physics, Osaka University, Japan

• Diño Wilson Agerico

  Department of Applied Physics, Osaka University, Japan Center for Atomic and Molecular Technologies, Osaka University, Japan

• Kasai Hideaki

  Department of Applied Physics, Osaka University, Japan Center for Atomic and Molecular Technologies, Osaka University, Japan

Abstract

Dissociative adsorption processes of O₂ molecule on Pt(111) surface are explored using quantum dynamical calculations based on coupled-channel method. The explored adsorption sites are the direct dissociative adsorption channels, where the precursor state for O₂ sticking are absent, with certain amount of activation barrier. We find that the dissociative sticking probability of O₂ depicts the sigmoidal (S-shaped) curve in all cases which is a manifestation of the tunneling effect. Moreover, the sticking curve is sensitively dependent on the shape of the activation barrier which affects the width of the transition region. Molecular vibration facilitates sticking and affects the width of the barrier. [DOI: 10.1380/ejssnt.2013.72]

Journal

• e-Journal of Surface Science and Nanotechnology

  e-Journal of Surface Science and Nanotechnology 11 (0), 72-75, 2013

  The Japan Society of Vacuum and Surface Science

Keywords

• O₂
• Pt(111) surface
• Dissociative adsorption
• Quantum dynamics
• Tunneling effect

Details

• CRID: 1390001205185840256
• NII Article ID: 130004933781
• DOI: 10.1380/ejssnt.2013.72
• ISSN: 13480391
• Web Site: https://www.jstage.jst.go.jp/article/ejssnt/11/0/11_72/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed