论文标题
高分辨率电子能量损失光谱对等离子鉴定的几何影响：石墨烯的一个例子
Geometric Effect of High-Resolution Electron Energy Loss Spectroscopy on the Identification of Plasmons: An Example of Graphene
论文作者
论文摘要
高分辨率电子损失光谱（HREELS）是检测等离子分散体的最强大方法之一。但是，我们发现在Hreels测量中，散射几何配置将严重影响等离子的识别。在这里，以石墨烯为例，使用能够二维能量摩托图映射的HREEL与强度分布计算相结合，我们从视觉上显示了散射几何因子的强度分布。我们证明，散射几何效应的能量损失峰可能会被误解为声学等离子体的特征。在任何HREELS测量中，都必须定量地评估散射几何形状的效果，以识别固有的表面激发。
High-resolution electron energy loss spectroscopy (HREELS) is one of the most powerful methods to detect the dispersion of plasmons. However, we find that in the HREELS measurement, the scattering geometric configuration will seriously affect the identification of plasmons. Here, taking graphene as an example, using the HREELS capable of two-dimensional energy-momentum mapping combined with the intensity distribution calculations, we visually display the intensity distribution of the scattering geometric factor. We demonstrate that the energy loss peaks from the scattering geometric effect may be misinterpreted as the features of an acoustic plasmon. In any HREELS measurement, it is necessary to evaluate the effect of the scattering geometry quantitatively to identify the intrinsic surface excitations.
