Department of Applied Physics, ERICA, Hanyang University, Gyeonggi 426-791, Korea.
J Chem Phys. 2010 Jul 21;133(3):034501. doi: 10.1063/1.3458910.
By using high resolution x-ray photoelectron spectroscopy, we show that inelastic scattering of photoelectron at low temperature (30-50 K) generates two kinds of oxygen species on Pt (111) surface. Intense synchrotron radiation source dissociates oxygen molecules into chemisorbed atomic oxygen and induces the formation of PtO on the surface. Estimated coverage of dissociated atomic oxygen is 0.5 ML, suggesting possible formation of p(2 x 1) surface structure, while PtO coverage shows saturation coverage of 0.5 ML. Molecular oxygen dosed at 30 K undergoes thermally activated transition from physisorbed to chemisorbed state at around 40 K.
利用高分辨率 X 射线光电子能谱，我们表明在低温（30-50 K）下，光电子的非弹性散射在 Pt（111）表面上产生了两种氧物种。强同步辐射源将氧分子离解成化学吸附的原子氧，并诱导表面上形成 PtO。离解的原子氧的估计覆盖度为 0.5 ML，表明可能形成 p(2 x 1)表面结构，而 PtO 的覆盖度则表现出 0.5 ML 的饱和覆盖度。在 30 K 下注入的氧气在大约 40 K 时经历从物理吸附到化学吸附状态的热激活转变。
