Journal of the Vacuum Society of Japan
Online ISSN : 1882-4749
Print ISSN : 1882-2398
ISSN-L : 1882-2398
Letter
Tunneling Effect in Dissociative Adsorption of O2 on Pt(001) Surface
Koji SHIMIZUWilson Agerico DIÑOHideaki KASAI
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2013 Volume 56 Issue 10 Pages 425-427

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Abstract

  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.

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© 2013 The Vacuum Society of Japan
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