TY  - JOUR
AU  - Krause, F. F.
AU  - Rosenauer, A.
AU  - Barthel, Juri
AU  - Mayer, Joachim
AU  - Urban, Knut
AU  - Dunin-Borkowski, Rafal
AU  - Brown, H. G.
AU  - Forbes, B. D.
AU  - Allen, Leslie J.
TI  - Atomic resolution elemental mapping using energy-filtered imaging scanning transmission electron microscopy with chromatic aberration correction
JO  - Ultramicroscopy
VL  - 181
SN  - 0304-3991
CY  - Amsterdam
PB  - Elsevier Science
M1  - FZJ-2017-06628
SP  - 173 - 177
PY  - 2017
AB  - This paper addresses a novel approach to atomic resolution elemental mapping, demonstrating a method that produces elemental maps with a similar resolution to the established method of electron energy-loss spectroscopy in scanning transmission electron microscopy. Dubbed energy-filtered imaging scanning transmission electron microscopy (EFISTEM) this mode of imaging is, by the quantum mechanical principle of reciprocity, equivalent to tilting the probe in energy-filtered transmission electron microscopy (EFTEM) through a cone and incoherently averaging the results. In this paper we present a proof-of-principle EFISTEM experimental study on strontium titanate. The present approach, made possible by chromatic aberration correction, has the advantage that it provides elemental maps which are immune to spatial incoherence in the electron source, coherent aberrations in the probe-forming lens and probe jitter. The veracity of the experiment is supported by quantum mechanical image simulations, which provide an insight into the image-forming process. Elemental maps obtained in EFTEM suffer from the effect known as preservation of elastic contrast, which, for example, can lead to a given atomic species appearing to be in atomic columns where it is not to be found. EFISTEM very substantially reduces the preservation of elastic contrast and yields images which show stability of contrast with changing thickness. The experimental application is demonstrated in a proof-of-principle study on strontium titanate.
LB  - PUB:(DE-HGF)16
C6  - pmid:28601013
UR  - <Go to ISI:>//WOS:000411170800021
DO  - DOI:10.1016/j.ultramic.2017.06.004
UR  - https://juser.fz-juelich.de/record/837851
ER  -