Large angle illumination enabling accurate structure reconstruction from thick samples in scanning transmission electron microscopy.
Ultramicroscopy
; 197: 112-121, 2019 02.
Article
in En
| MEDLINE
| ID: mdl-30594057
ABSTRACT
Most reconstructions of the electrostatic potential of a specimen at atomic resolution assume a thin and weakly scattering sample, restricting accurate quantification to specimens only tens of Ångströms thick. We demonstrate that using large-angle-illumination scanning transmission electron microscopy (STEM)-a probe forming aperture with convergence angle larger than about 50 mrad-allows us to better meet the weak phase object approximation and thereby accurately reconstruct the electrostatic potential in samples thicker than the order of 100 Å.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Ultramicroscopy
Year:
2019
Document type:
Article