Adsorption of hydrogen and deuterium on Ru(001)
Adsorption of hydrogen and deuterium on Ru(001)
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Ru(001) 上氢和氘的吸附
DOI：
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发表时间：
1984
期刊：
影响因子：
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通讯作者：
R. Unwin
中科院分区：
文献类型：
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作者：
H. Conrad;R. Scala;W. Stenzel;R. Unwin
用高分辨电子能量损失谱(HREELS)研究了氢和氚的吸附。在105K的最大覆盖率下，H附着层在102meV(ν1)和141meV(ν2)处表现出两个主要的损耗特征，其强度随初级电子能量的变化而显著变化(最大值在5 eV到6 eV之间)。氢被分配到Ru (001)表面的三配位，导致了吸附络合物的C3v对称性。这两个损耗峰的角度依赖关系只显示了非镜面方向的平滑强度衰减，从而防止了偶极子和碰撞散射贡献的分离。另外三个强度较低的损耗峰在泛音和组合激发下被识别出来。由各能量导出的非谐系数用一阶微扰理论拟合出垂直于表面的氢原子的二维势函数。
The adsorption of hydrogen and deuterium has been studied with high resolution electron energy loss spectroscopy (HREELS). At maximum coverage at 105 K the H adlayer exhibits two dominant loss features at 102 (ν1) and 141 (ν2) meV which show pronounced intensity variations as a function of the primary electron energy (maximum between 5 and 6 eV). The hydrogen is assigned to the threefold coordinated site of the Ru (001) surface leading to a C3v symmetry of the adsorption complex. The angular dependence of both loss peaks shows only a smooth intensity decrease in off‐specular directions thus preventing the separation of dipole and impact scattering contributions. Three additional loss peaks with considerably lower intensities are identified with overtone and combination excitations. The anharmonicity coefficients derived from the respective energies are used to fit a two‐dimensional potential function for the hydrogen atom located in a plane perpendicular to the surface with first order perturbation theory...