Vibrationally-assisted dissociative adsorption of oxygen on Ru(0 0 0 1)-p(2 × 1)-O

• Published in: Surface science Vol. 601; no. 18; pp. 3809 - 3812
• Main Authors: Takahashi, Shin, Fujimoto, Yosuke, Teraoka, Yuden, Yoshigoe, Akitaka, Okuyama, Hiroshi, Aruga, Tetsuya
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Lausanne Elsevier B.V 15-09-2007; Amsterdam Elsevier Science; New York, NY
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; High resolution XPS; Oxygen; Physics; Supersonic molecular beam; Vibrational excitation; Vibrational excitation; Oxygen; Supersonic molecular beam; Ru; High resolution XPS; Molecular beams; X-ray photoelectron spectra
• ISSN: 0039-6028; 1879-2758
• DOI: 10.1016/j.susc.2007.04.038

Supersonic molecular beam technique combined with high resolution X-ray photoelectron spectroscopy using synchrotron radiation was applied to the study of the dynamics of dissociative adsorption of oxygen on Ru(0
0
0
1) surface in high coverage region. The Ru(0
0
0
1) surface pre-covered with oxygen atoms of 0.5
monolayer, which corresponds to the p(2
×
1)-O structure, was dosed to oxygen molecules with translational energy of 0.5
eV. Oxygen uptake was compared between the cases with and without the beam source heated in order to verify the effects of internal energy of oxygen. We found drastic enhancement in initial sticking probability of oxygen when the beam source was heated to 1400
K. We concluded that the enhancement of sticking probability is mainly caused by molecular vibrational excitation, indicating that dissociation barrier is located in the exit channel on potential energy surface.