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首页> 外文期刊>Physical review >Surface core-level shifts at vicinal tungsten surfaces
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Surface core-level shifts at vicinal tungsten surfaces

机译：邻近钨表面的表面核心能级变化

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摘要

Core-level 4f_(7/2) photoemission spectra are measured for W(110) and for two stepped-surface planes along the {100} zone: W(540) and W(320). The vicinal-surface spectra are fit using a four-component Doniach-Sunjic-Gaussian function with variable parameters that allow independent variation in the peak locations and intensities based on the different nearest-neighbor coordination of surface atoms. The new experimental results differ significantly from all prior experimental studies of surface core-level shifts associated with vicinal tungsten surfaces. Surface step-atom core-level binding energies obtained from the photoemission spectra are found to be in excellent agreement with simple local-coordination models and initial-state shifts from ab initio calculations of surface core-level shifts and confirm general trends associated with application of coordination models to both low- and high-index tungsten surfaces. No compelling evidence of coordination-dependent final-state effects is observed. Effects on core-level spectra and surface core-level shifts associated with surface hydrogen dose are investigated. Vicinal surface spectra of tungsten are shown to be more sensitive to hydrogen doses than parent low-index surfaces, possibly accounting for prior difficulty in obtaining consistent core-level photoemission spectra for vicinal tungsten surfaces.
机译：对W（110）和沿{100}区域的两个阶梯表面平面：W（540）和W（320）测量了核心能级4f_（7/2）的光发射光谱。使用具有可变参数的四分量Doniach-Sunjic-Gaussian函数拟合邻域表面光谱，这些参数允许根据表面原子的不同近邻配位，使峰的位置和强度发生独立变化。新的实验结果与先前所有与邻近钨表面相关的表面核心能级变化的实验研究均存在显着差异。从光发射光谱获得的表面阶跃原子核心能级结合能与简单的局部配位模型和表面核能级从头算的初始状态转变具有极佳的一致性，并证实了与应用的相关的一般趋势。低和高折射率钨表面的协调模型。没有令人信服的证据表明依赖于协调的最终状态的影响。研究了与表面氢剂量有关的对核心能级谱和表面核心能级位移的影响。钨的相邻表面光谱显示出比母体低折射率表面对氢剂量更敏感，这可能解释了先前难以获得相邻钨表面的一致的核心能级光发射光谱的困难。

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