Hostname: page-component-78c5997874-fbnjt Total loading time: 0 Render date: 2024-11-09T08:58:47.607Z Has data issue: false hasContentIssue false
  • English
  • Français

Interpretation of Atomic Resolution Eels Signals at Interfaces

Published online by Cambridge University Press:  02 July 2020

G. Möbus  and
S. Nufer
G. Möbus
Affiliation:
Department of Materials, Oxford University, Oxford, OX1 3PH, UK
S. Nufer
Affiliation:
Max-Planck-Institut fur Metallforschung, Seestrasse 92, D-70174 Stuttgart, Germany.
Get access

Abstract

Introduction: Atomically resolved chemical analysis by means of electron energy (core-) loss spectroscopy has been postulated since the technical availability of highly focused sub-nm STEM beams. We study the feasibility of this approach, as compared to the alternative of spatial difference spectra, where interfacial resolution is achieved by subtracting boxes at and apart from the interface. A nanobeam EELS signal is generated by the dynamical propagation of a conical wave through the specimen. This wave acts as 3D-excitation envelope for inelastic scattering and is needed to link the ab-initio calculated atom- and angular-momentum-projected density-of-state (DOS) functions to measurable EELS signals.

Projected DOS: For the rhombohedral twin grain boundary in sapphire (FIG 1) as model system, DOS for p states in oxygen have been calculated 4 as described in , for the most stable twin structure obtained by ab-initio calculations.

Type
EELS Microanalysis at High Sensitivity: Advances in Spectrum Imaging, Energy Filtering and Detection (Organized by R. Leapman and J. Bruley)
Information
Microscopy and Microanalysis , Volume 7 , Issue S2: Proceedings: Microscopy & Microanalysis 2001, Microscopy Society of America 59th Annual Meeting, Microbeam Analysis Society 35th Annual Meeting, Long Beach, California August 5-9, 2001 , August 2001 , pp. 1180 - 1181
Copyright
Copyright © Microscopy Society of America 2001

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Krivanek, O.L. & Kruit, P. ed., proceed. “TARA”, Seattle, Ultramicroscopy, special issue, vol. 78 (1999)Google Scholar

2. Duscher, G., Browning, ND, Pennycook, SJ, phys stat sol A 166, 327 (1998)3.0.CO;2-R>CrossRefGoogle Scholar

3. Bruley, J., Microsc. Microanal. Microstruct. 4, 23 (1993).CrossRefGoogle Scholar

4. Nufer, S, Marinopoulos, A.G., C Elsässer, , personal communication (2001).Google Scholar

5. Köstlmeier, S and Elsasser, C, Phys. Rev B60, 14025 (1999), and Ultramicrosc. (2001), in pressGoogle Scholar

6. Marinopoulos, A.G. and Elsässer, C., Acta Mater. 48, 4375 (2000).CrossRefGoogle Scholar

7. Möbus, G, Proceed. EUREM 12, Frank, L., Ciampor, F eds, Brno, Vol I, 385 (2000)Google Scholar

8. Funding by EPSRC (G.M.) and DFG (EL 155/4-1) is gratefully acknowledged.Google Scholar