Retrieving the energy-loss function from VEELS

The retardation and surface effect can been removed if the thickness of sample is known.
73 descargas
Actualizado 5 Nov 2020

Ver licencia

With recent rapid advancement in electron microscopy instrumentation, in particular, bright electron sources and monochromators, valence electron energy-loss spectroscopy (VEELS) has become attractive for retrieving band structures, optical properties, dielectric functions and phonon information of materials. However, Cherenkov radiation and surface-loss contribution significantly alter fine structures of VEELS, even in simple semiconductors and insulators. This leads to the problem that dielectric function or bandgap structure of these materials cannot be determined correctly if these effects are not removed. In this work we present a solution to this dilemma. We demonstrate that energy-loss function and real part of inverse complex dielectric function can be retrieved from raw data of VEELS. Based on the calculated example of Si, the limitation of our approach is discussed. We believe that our approach represents an improvement over previous procedures and has a broad prospect for applications. The detailed description will be published in Ultramicroscopy

Citar como

Qingping Meng (2024). Retrieving the energy-loss function from VEELS (https://www.mathworks.com/matlabcentral/fileexchange/68371-retrieving-the-energy-loss-function-from-veels), MATLAB Central File Exchange. Recuperado .

Compatibilidad con la versión de MATLAB
Se creó con R2018a
Compatible con cualquier versión
Compatibilidad con las plataformas
Windows macOS Linux
Categorías
Más información sobre Atomic, Molecular & Optical en Help Center y MATLAB Answers.
Etiquetas Añadir etiquetas

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Modified Version/1- Original codes

Modified Version/2- Code for only extracting epsilon

Modified Version/3- Codes for Cerenkov and surface loss

Versión Publicado Notas de la versión
1.0.2

This version is modified by Nima Nikpoor Badr.

1.0.1

Description are reedited

1.0.0