Fast pixelated detectors in scanning transmission electron microscopy. Part II: post acquisition data processing, visualisation, and structural characterisation

Paterson, G. W. , Webster, R. W.H., Ross, A., Paton, K. A. , Macgregor, T. A., McGrouther, D. , MacLaren, I. and Nord, M. (2020) Fast pixelated detectors in scanning transmission electron microscopy. Part II: post acquisition data processing, visualisation, and structural characterisation. arXiv, (Unpublished)

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Publisher's URL: https://arxiv.org/abs/2004.02777

Abstract

Fast pixelated detectors incorporating direct electron detection (DED) technology are increasingly being regarded as universal detectors for scanning transmission electron microscopy (STEM), capable of imaging under multiple modes of operation. However, several issues remain around the post acquisition processing and visualisation of the often very large multidimensional STEM datasets produced by them. We discuss these issues and present open source software libraries to enable efficient processing and visualisation of such datasets. Throughout, we provide examples of the analysis methodologies presented, utilising data from a 256×256 pixel Medipix3 hybrid DED detector, with a particular focus on the STEM characterisation of the structural properties of materials. These include the techniques of virtual detector imaging; higher order Laue zone analysis; nanobeam electron diffraction; and scanning precession electron diffraction. In the latter, we demonstrate nanoscale lattice parameter mapping with precision in the low to mid 10⁻⁴ (10⁻²\%), a value comparable to the best ones reported elsewhere.

Item Type:Articles
Status:Unpublished
Refereed:No
Glasgow Author(s) Enlighten ID:McGrouther, Dr Damien and MacLaren, Dr Ian and Paton, Ms Kirsty and Webster, Robert and Macgregor, Thomas and Paterson, Dr Gary and Nord, Dr Magnus
Authors: Paterson, G. W., Webster, R. W.H., Ross, A., Paton, K. A., Macgregor, T. A., McGrouther, D., MacLaren, I., and Nord, M.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:arXiv
Copyright Holders:Copyright © 2020 The Authors
Publisher Policy:Reproduced with the permission of the Authors

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
171131Fast Pixel Detectors: a paradigm shift in STEM imagingIan MacLarenEngineering and Physical Sciences Research Council (EPSRC)EP/M009963/1P&S - Physics & Astronomy
190883Consortium for advanced materials based on spin chiralityStephen McVitieEngineering and Physical Sciences Research Council (EPSRC)EP/M024423/1P&S - Physics & Astronomy
172865EPSRC DTP 16/17 and 17/18Tania GalabovaEngineering and Physical Sciences Research Council (EPSRC)EP/N509668/1Research and Innovation Services
304896EPSRC-IAA: Early Stage Commercialisation of a PET Imaging Agent for the Detection of Cardiovascular Disease and CancerAndrew SutherlandEngineering and Physical Sciences Research Council (EPSRC)EP/R511705/1Chemistry