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首页> 外文期刊>Applied Surface Science >High temperature STM/STS investigations of resonant image states on Au(111)
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High temperature STM/STS investigations of resonant image states on Au(111)

机译：Au（111）上共振像态的高温STM / STS研究

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Scanning tunneling microscopy (STM) and spectroscopy (STS) were used to study the electronic structure of Au(1 1 1) surface in the range of 2-5.5 eV above the Fermi level. In this paper, we concentrate firstly on the position of the upper band gap edge (BE) existing in [ 1 1 1 ] direction in Au(1 1 1) and secondly on the position ofthe resonant image potential surface state (RIS) located in the bulk states approximately 1.1 eV above BE. The experiment was carried out in UHV at two temperatures 294 K and 580 K. Our high temperature STS (HT-STS) results clearly show the presence of RIS and BE local maxima at both temperatures. What is more, a slight shift towards the Fermi level of BE and RIS was observed. Those shifts were the consequence of the change of [1 1 1] band gap and lowering gold work function due to the thermal extension of interatomic distances. Finally, estimation of the work function was given at 294 K and 580 K.
机译：扫描隧道显微镜（STM）和光谱（STS）用于研究在费米能级以上2-5.5 eV范围内Au（1 1 1）表面的电子结构。在本文中，我们首先集中在Au（1 1 1）中在[1 1 1]方向上存在的上带隙边缘（BE）的位置，其次集中在位于大体上比BE高约1.1 eV。该实验是在294 K和580 K两个温度下的特高压中进行的。我们的高温STS（HT-STS）结果清楚地表明了在两个温度下RIS和BE局部最大值的存在。此外，观察到BE和RIS的费米水平略有变化。这些移动是由于[1 1 1]带隙的变化以及由于原子间距离的热扩展而降低的金功函数的结果。最后，功函数的估计为294 K和580K。

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