角动量分辨电子能量损失谱的演示。

Demonstration of angular-momentum-resolved electron energy-loss spectroscopy.

作者信息

Tavabi A H, Rosi P, Bertoni G, Rotunno E, Belsito L, Roncaglia A, Frabboni S, Gazzadi G C, Karimi E, Tiemeijer P, Dunin-Borkowski R E, Grillo V

机构信息

Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich, 52425, Jülich, Germany.

Istituto Nanoscienze, Consiglio Nazionale delle Ricerche, Via G. Campi 213/A, 41125, Modena, Italy.

出版信息

Nat Commun. 2025 Jul 17;16(1):6601. doi: 10.1038/s41467-025-60804-3.

DOI:10.1038/s41467-025-60804-3

PMID:40675985

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12271546/

Abstract

Rotational invariance is a fundamental aspect of symmetry in scattering processes from atomic potentials. Here, we present an approach for measuring orbital angular momentum (OAM), a key descriptor of rotational symmetry, during measurements of atomic transitions. We use an electron optical OAM sorter in combination with electron energy-loss spectroscopy and model-based fitting to separately measure the π* and σ* antibonding transitions in hexagonal boron nitride on the atomic scale. This approach also offers prospects for efficient and atomically-resolved magnetic chiral dichroism measurements.

摘要

旋转不变性是原子势散射过程中对称性的一个基本方面。在这里，我们提出了一种在原子跃迁测量过程中测量轨道角动量（OAM）的方法，OAM是旋转对称性的一个关键描述符。我们将电子光学OAM分选器与电子能量损失谱和基于模型的拟合相结合，在原子尺度上分别测量六方氮化硼中的π和σ反键跃迁。这种方法也为高效和原子分辨的磁圆二色性测量提供了前景。