Breakdown of the dipole approximation in core losses

The validity of the dipole approximations commonly used in the inelastic scattering theory for transmission electron microscopy is reviewed. Both experimental and numerical arguments are presented, emphasizing that the dipole approximations cause significant errors of the order of up to 25% even at...

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Detalles Bibliográficos
Autores principales: Löffler, S., Ennen, I., Tian, F., Schattschneider, P., Jaouen, N.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2011
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3268650/
https://www.ncbi.nlm.nih.gov/pubmed/21741917
http://dx.doi.org/10.1016/j.ultramic.2011.03.006
Descripción
Sumario:The validity of the dipole approximations commonly used in the inelastic scattering theory for transmission electron microscopy is reviewed. Both experimental and numerical arguments are presented, emphasizing that the dipole approximations cause significant errors of the order of up to 25% even at small momentum transfer. This behavior is attributed mainly to non-linear contributions to the dynamic form factor due to the overlap of wave functions.

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