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Determination Of Deuterium Adsorption Site On Palladium(100) Using Low Energy Ion Recoil Spectroscopy

机译:低能离子反冲光谱法测定钯(100)上的氘吸附位

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Ion beam analysis has been recently applied to study the adsorption phenomena of some adsorbates on metal surfaces. In this paper, surface recoils created by low energy Ne~+ ions are employed to study the adsorption site of deuterium (D) atoms on Pd(100). This technique is extremely surface sensitive with the capacity for atomic layer depth resolution. From azimuthal angle observations of Pd(100) specimen, it was found that at room temperature, D was adsorbed in the fourfold hollow site of Pd(100) at a height of 0.25 ± 0.05 A above the surface. The adsorbate remains in the hollow site at all temperatures to 383 K though the vertical height above the surface is found to depend on coverage and for the first time evidence is found of a transition to a p(2 × 2) structure for the adsorbate. There is no evidence of D sitting in the Pd(100) subsurface at room and higher temperatures.
机译:离子束分析最近已被用于研究某些被吸附物在金属表面上的吸附现象。本文利用低能Ne〜+离子产生的表面反冲力研究氘(D)原子在Pd(100)上的吸附位。该技术对表面非常敏感,并且具有原子层深度分辨率的能力。从Pd(100)标本的方位角观察,发现在室温下,D吸附在Pd(100)的四重空心部位,其表面高度为0.25±0.05A。尽管发现表面上方的垂直高度取决于覆盖率,但被吸附物在所有温度下均保持在383 K的中空位置,并且首次发现被吸附物过渡到p(2×2)结构的证据。没有证据表明在室温和更高温度下D位于Pd(100)地下。

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