论文标题
在表面快速原子衍射中的温度依赖性
Temperature dependence in fast-atom diffraction at surfaces
论文作者
论文摘要
放牧的发病率在晶体表面（Gifad或FAD）处的快速原子衍射表明，在接近一个EV的有效能量（HE约$λ_\ perp \ $ 14 pm）和升高的表面温度下，在有效的能量下表现出连贯的衍射，可提供高拓扑分辨率和高拓扑分辨率和实时监测生长过程。这是由特有的有利的Debye-Waller因子对放牧发生率的多重碰撞制度进行了解释。本文介绍了在LIF表面上对177至1017 K之间温度行为的首次广泛评估。与在热能处的衍射相似，观察到弹性强度的指数衰减，但最大相干性几乎不受吸引力的限制。它受表面刚度的影响更大，并且似乎对表面缺陷非常敏感。
Grazing incidence fast atom diffraction at crystal surfaces (GIFAD or FAD) has demonstrated coherent diffraction both at effective energies close to one eV ($λ_\perp\approx$ 14 pm for He) and at elevated surface temperatures offering high topological resolution and real time monitoring of growth processes. This is explained by a favorable Debye-Waller factor specific to the multiple collision regime of grazing incidence. This paper presents the first extensive evaluation of the temperature behavior between 177 and 1017 K on a LiF surface. Similarly to diffraction at thermal energies, an exponential attenuation of the elastic intensity is observed but the maximum coherence is hardly limited by the attraction forces. It is more influenced by the surface stiffness and appears very sensitive to surface defects.
