Correction of EELS dispersion non-uniformities for improved chemical shift analysis

Webster, R.W.H., Craven, A.J., Schaffer, B., McFadzean, S., MacLaren, I. and MacLaren, D.A. (2020) Correction of EELS dispersion non-uniformities for improved chemical shift analysis. Ultramicroscopy, 217, 113069. (doi: 10.1016/j.ultramic.2020.113069)

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Abstract

We outline a simple routine to correct for non-uniformities in the energy dispersion of a post-column electron energy-loss spectrometer for use in scanning transmission electron microscopy. We directly measure the dispersion and its variations by sweeping a spectral feature across the full camera to produce a calibration that can be used to linearize datasets post-acquisition, without the need for reference materials. The improvements are illustrated using core excitation electron energy-loss spectroscopy (EELS) spectra collected from NiO and diamond samples. The calibration is rapid and will be of use in all EELS analysis, particularly in assessments of the chemical states of materials via the chemical shift of core-loss excitations.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Webster, Robert and Craven, Professor Alan and McFadzean, Dr Sam and MacLaren, Dr Donald and MacLaren, Dr Ian
Authors: Webster, R.W.H., Craven, A.J., Schaffer, B., McFadzean, S., MacLaren, I., and MacLaren, D.A.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Ultramicroscopy
Publisher:Elsevier
ISSN:0304-3991
ISSN (Online):1879-2723
Published Online:02 July 2020
Copyright Holders:Copyright © 2020 The Authors
First Published:First published in Ultramicroscopy 217: 113069
Publisher Policy:Reproduced under a Creative Commons License
Data DOI:10.5525/gla.researchdata.1032

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
172181Nanostructured half-Heuslers for thermoelectric waste heat recoveryDonald MaclarenEngineering and Physical Sciences Research Council (EPSRC)EP/N017218/1P&S - Physics & Astronomy
172865EPSRC DTP 16/17 and 17/18Tania GalabovaEngineering and Physical Sciences Research Council (EPSRC)EP/N509668/1Research and Innovation Services