Progress in electron Compton scattering

Schattschneider, P.; Exner, Alfred

doi:10.1016/0304-3991(95)00032-v

Cited by 16 publications

(3 citation statements)

References 11 publications

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“…Electron energy loss spectroscopy (EELS) data acquired at sufficiently large scattering angles display a broad Compton peak, which is a two-dimensional “slice” at constant momentum through the three-dimensional Bethe surface (Inokuti, 1971; Schattschneider & Exner, 1995; Egerton, 2011). The Compton peak is due to scattering of the incident electron with an atomic electron in the solid.…”

Section: Introductionmentioning

confidence: 99%

Towards Electron Energy Loss Compton Spectra Free From Dynamical Diffraction Artifacts

Mendis

Talmantaite

2022

Microscopy and Microanalysis

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The Compton signal in electron energy loss spectroscopy (EELS) is used to determine the projected electron momentum density of states for the solid. A frequent limitation however is the strong dynamical scattering of the incident electron beam within a crystalline specimen, i.e. Bragg diffracted beams can be additional sources of Compton scattering that distort the measured profile from its true shape. The Compton profile is simulated via a multislice method that models dynamical scattering both before and after the Compton energy loss event. Simulations indicate the importance of both the specimen illumination condition and EELS detection geometry. Based on this, a strategy to minimize diffraction artifacts is proposed and verified experimentally. Furthermore, an inversion algorithm to extract the projected momentum density of states from a Compton measurement performed under strong diffraction conditions is demonstrated. The findings enable a new route to more accurate electron Compton data from crystalline specimens.

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Section: Introductionmentioning

confidence: 99%

Towards Electron Energy Loss Compton Spectra Free From Dynamical Diffraction Artifacts

Mendis

Talmantaite

2022

Microscopy and Microanalysis

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“…The Compton profile can be extracted from EELS in the large energy-loss region (more than 1000 eV), known as the electron Compton scattering from solids (ECOSS) 15 . In terms of electron microscopy, ECOSS is electron energy-loss spectrum (EELS) recording in diffraction mode at large scattering angle, performing an energy scan across the Bethe ridge 16–18 . ECOSS is a powerful tool to study the ground-state electronic momentum density of solids, especially for nanomaterials 17,19 .…”

Section: Introductionmentioning

confidence: 99%

Combined study of the ground and excited states in the transformation of nanodiamonds into carbon onions by electron energy-loss spectroscopy

Feng

Lin

Tian

et al. 2019

Sci Rep

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The electron momentum density and sp 2 /sp 3 ratio of carbon materials in the thermal transformation of detonation nanodiamonds (ND) into carbon nano-onions are systematically studied by electron energy-loss spectroscopy (EELS). Electron energy-loss near-edge structures of the carbon K-ionization in the electron energy-loss spectroscopy are measured to determine the sp 2 content of the ND-derived samples. We use the method developed by Titantah and Lamoen, which is based on the ability to isolate the π * spectrum and has been shown to give reliable and accurate results. Compton profiles (CPs) of the ND-derived carbon materials are obtained by performing EELS on the electron Compton scattering region. The amplitude of the CPs at zero momentum increases with increasing annealing temperature above 500 °C. The dramatic changes occur in the temperature range of 900–1300 °C, which indicates that the graphitization process mainly occurs in this annealing temperature region. Our results complement the previous work on the thermal transformation of ND-derived carbon onions and provide deeper insight into the evolution of the electronic properties in the graphitization process.

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“…The use of electrons instead of photons as a probe for Compton scattering of a solid via transmission electron microscopy (TEM) was suggested by Williams et al (1981). In electron microscopy, the electron Compton scattering from a solid (ECOSS) is measured via the electron energy-loss spectrum (EELS) acquired in diffraction mode at large scattering angles, performing an energy scan across the Bethe ridge (Williams & Bourdillon 1982; Williams & Thomas 1983; Williams et al,1984; Schattschneider & Exner, 1995). It has been demonstrated that ECOSS yields a result that is equivalent to photon Compton scattering for the electron momentum distribution of the scatter (Schattschneider et al, 1991; Manninen, 2000).…”

Section: Introductionmentioning

confidence: 99%

Investigation of Electron Momentum Density in Carbon Nanotubes Using Transmission Electron Microscopy

Feng

Wang

et al. 2019

Microsc Microanal

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Valence Compton profiles (CPs) of multiwall (MWCNTs) and single-wall carbon nanotubes (SWCNTs) were obtained by recording electron energy-loss spectra at large momentum transfer in the transmission electron microscope, a technique known as electron Compton scattering from solids (ECOSS). The experimental MWCNT/SWCNT results were compared with that of graphite. Differences between the valence CPs of MWCNTs and SWCNTs were observed, and the SWCNT CPs indicate a greater delocalization of the ground-state charge density compared to graphite. The results clearly demonstrate the feasibility and potential of the ECOSS technique as a complementary tool for studying the electronic structure of materials with nanoscale spatial resolution.

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Progress in electron Compton scattering

Cited by 16 publications

References 11 publications

Towards Electron Energy Loss Compton Spectra Free From Dynamical Diffraction Artifacts

Towards Electron Energy Loss Compton Spectra Free From Dynamical Diffraction Artifacts

Combined study of the ground and excited states in the transformation of nanodiamonds into carbon onions by electron energy-loss spectroscopy

Investigation of Electron Momentum Density in Carbon Nanotubes Using Transmission Electron Microscopy

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