Tunneling Effect in Dissociative Adsorption of O₂ on Pt(001) Surface

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  • SHIMIZU Koji
    Department of Applied Physics, Osaka University
  • DIÑO Wilson Agerico
    Department of Applied Physics, Osaka University Center for Atomic and Molecular Technologies, Osaka University
  • KASAI Hideaki
    Department of Applied Physics, Osaka University Center for Atomic and Molecular Technologies, Osaka University

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  • Tunneling Effect in Dissociative Adsorption of O<sub>2</sub> on Pt(001) Surface

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  Dissociative adsorption process of O2 molecule on Pt(001) surface are explored using quantum dynamical calculations based on coupled-channel method. The explored adsorption sites are the direct dissociative adsorption channels, where the molecularly adsorption or 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. Finally, the tunneling effect can be clearly acknowledged from the wave function of O2.<br>

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