Title of article
Breakdown of the dipole approximation in core losses
Author/Authors
Lِffler، نويسنده , , Alla S. and Ennen، نويسنده , , I. and Tian، نويسنده , , F. and Schattschneider، نويسنده , , P. and Jaouen، نويسنده , , N.، نويسنده ,
Pages
5
From page
1163
To page
1167
Abstract
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.
Keywords
Ionization edges , eels , Dipole approximation , scattering cross section
Journal title
Astroparticle Physics
Record number
2050796
Link To Document