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<p>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.</p>

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

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月17日

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

摘要

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.