Work

Bethe ridge electron Compton spectroscopy

Year: 2025

Type: article

Abstract: Compton spectroscopy measures J ( p z ) , the density of occupied electronic states with momentum component p z . In a transmission electron microscope (TEM) Compton spectroscopy is performed by acquiring a momentum resolved, dark-field electron energy loss spectrum (EELS). Here it is shown that the Bethe ridge in a single energy filtered diffraction pattern can provide identical J ( p z ) information. The energy filtered TEM (EFTEM) approach is more dose efficient, since all (projected) momenta p z are recorded in parallel. For weakly diffracting specimens, the J ( p z ) profiles extracted using EFTEM are in reasonable agreement with dark-field EELS. Bragg diffraction and thermal diffuse scattering are known to introduce artefacts in Compton spectroscopy, and this is true for the EFTEM method as well. The artefacts can however be mitigated by analysing suitably thin specimens.

Source: Ultramicroscopy

DOI: 10.1016/j.ultramic.2025.114264

Authors: BG Mendis, SP Hayes, COG Williamson, K Dhamotharan, SJ Clark

Institution: Durham University

Language: English

Topic: Advanced Electron Microscopy Techniques and Applications

Subfield: Structural Biology

Field: Biochemistry, Genetics and Molecular Biology

Domain: Life Sciences

Open Access status: hybrid

Estimated APC paid: $3,760

Funders: Durham University, Engineering and Physical Sciences Research Council