论文标题
放牧发生率的LIF（001）氦散射的热影响
Thermal effects on helium scattering from LiF(001) at grazing incidence
论文作者
论文摘要
放牧的含量快速原子衍射（GIFAD）是一种非常敏感的表面分析方法，不仅可以在室温下，而且可以在较高的温度下应用。在这项工作中，我们使用HE-LIF（001）系统作为基准来研究温度对绝缘体表面的GIFAD模式的影响。我们的理论描述基于声子表面的初始值表示（P0-SIVR）近似，这是一种半夸张方法，其中包含对弹性散射的贡献。在P0-SIVR方法中，研究了由热晶格振动引入的主要特征，这些特征是散射弹丸的角度分布作为晶体温度的函数。我们发现，方位角和极性光谱受热波动的强烈影响，从而改变了干扰结构的相对强度和极性扩散。这些发现与在表面研究中使用GIFAD有关。此外，目前的结果与室温下的可用实验数据形成鲜明对比。
Grazing-incidence fast atom diffraction (GIFAD) is an exceptionally sensitive method for surface analysis, which can be applied not only at room temperature but also at higher temperatures. In this work we use the He-LiF(001) system as benchmark to study the influence of temperature on GIFAD patterns from insulator surfaces. Our theoretical description is based on the Phonon-Surface Initial Value Representation (P0-SIVR) approximation, which is a semiquantum approach that includes the phonon contribution to the elastic scattering. Within the P0-SIVR approach the main features introduced by thermal lattice vibrations on the angular distributions of scattered projectiles are investigated as a function of the crystal temperature. We found that azimuthal and polar spectra are strongly affected by thermal fluctuations, which modify the relative intensities and the polar spread of the interference structures. These findings are relevant for the use of GIFAD in surface research. Moreover, the present results are contrasted with available experimental data at room temperature.
