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Comparison of hydrogen and deuterium adsorption on Pd(100)

机译:氢和氘在Pd(100)上的吸附比较

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Low energy ion recoil spectroscopy is a powerful technique for the determination of adsorbate position on metal surfaces. In this study, this technique is employed to compare the adsorption sites of hydrogen and deuterium on Pd(100) by detection of either H or D recoil ions produced by Ne+ bombardment. Comparisons of experimental and Kalypso simulated azimuthal yield distributions show that, at room temperature, both hydrogen isotopes are adsorbed in the fourfold hollow site of Pd(100), however, at different heights above the surface (H—0.20 A and D-0.25 A). The adsorbates remain in the hollow site at all temperatures up to 383 K even though they move up to 0.40–0.45 A above the surface. Density functional theory calculations show a similar coverage dependent adsorption height for both H and D and confirm a real difference between the H and D adsorption heights based on zero point energies.
机译:低能离子反冲光谱法是测定金属表面吸附物位置的有力技术。在这项研究中,该技术用于通过检测由Ne +轰击产生的H或D反冲离子来比较Pd(100)上氢和氘的吸附位。实验和Kalypso模拟方位角产量分布的比较表明,在室温下,两个氢同位素都吸附在Pd(100)的四个空心位中,但是在表面上方的不同高度处(H-0.20 A和D-0.25 A )。即使在高达383 K的所有温度下,被吸附物仍保留在中空部位,即使它们在表面上方移动了0.40–0.45A。密度泛函理论计算显示了H和D的相似的覆盖率依赖吸附高度,并基于零点能量确定了H和D吸附高度之间的实际差异。

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