Orientation dependence of ionization edges in EELS

Anisotropy in the density of unoccupied states can be detected in the fine structure of ionization edges in angle-resolved EELS. It is shown that in a crystal an interference term occurs in the inelastic signal, and how it relates to electron channeling and site selection. The combination of orientation and site selection induces subtle variations in the ELNES. It is shown how this technique can be used to analyze local anisotropy related to the point group of the target atom. A second example shows how to extract non-dipole transitions at small scattering angles.


Published in:
Ultramicroscopy, 86, 3-4, 343-353
Year:
2001
ISSN:
03043991
Keywords:
Laboratories:




 Record created 2009-02-17, last modified 2018-04-20


Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)