Breaking the spherical and chromatic aberration barrier in transmission electron microscopy

Freitag, Bert; Kujawa, Stephan; Mul, P.M.; Ringnalda, J.; Tiemeijer, Peter

doi:10.1016/j.ultramic.2004.09.013

Cited by 117 publications

(67 citation statements)

References 10 publications

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“…The availability of spherical aberration correction on the objective lens system gives a significant improvement in the level of information that can be obtained from samples. For example, minimising image delocalisation, especially near the edges of the particles makes it easier to interpret the surfaces and facets structures and reduces the electron dose to the sample for the same amount of information [6,16].…”

Section: Discussionmentioning

confidence: 99%

In-Situ Reduction of Promoted Cobalt Oxide Supported on Alumina by Environmental Transmission Electron Microscopy

et al. 2011

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Reduction of 12wt.%Co/0.5wt.%Re/a-Al 2 O 3 Fischer-Tropsch catalyst has been studied in-situ in an environmental transmission electron microscope. Reduction of Co 3 O 4 to metallic cobalt was observed dynamically at 360°C under 3.4 mbar H 2 . Structural and morphological changes were observed by high resolution transmission electron microscopy and scanning transmission electron microscopy imaging. The cobalt particles were mainly face centred cubic while some hexagonal close packed particles were also found. Reoxidation of the sample upon cooling to room temperature, still under flowing H 2 , underlines the reactivity of the nanoparticles and the importance of controlling the gas composition and specimen temperature during this type of experiment. Similar behaviour was observed for a non-promoted catalyst. Imaging and analysis of the promoted sample before and after reduction indicated a uniform distribution of the promoter.

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Section: Discussionmentioning

confidence: 99%

In-Situ Reduction of Promoted Cobalt Oxide Supported on Alumina by Environmental Transmission Electron Microscopy

et al. 2011

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“…The models used are again surface approximations, which are far from optimal solutions, especially since only a limited number of control points are available to estimate the surface parameters. An algorithm for the measurement and compensation of both LCA and ACA has been proposed for fluorescence microscopy by Kuzubek and Matula (2000), and for electron microscopes by Freitag et al (2005). These techniques are not transferrable to images acquired with regular imaging systems.…”

Section: Introductionmentioning

confidence: 99%

Calibration and removal of lateral chromatic aberration in images

Mallon

Whelan

2007

Pattern Recognition Letters

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This paper addresses the problem of compensating for lateral chromatic aberration in digital images through colour plane realignment. Two main contributions are made: the derivation of a model for lateral chromatic aberration in images, and the subsequent calibration of this model from a single view of a chess pattern. These advances lead to a practical and accurate alternative for the compensation of lateral chromatic aberrations. Experimental results validate the proposed models and calibration algorithm. The effects of colour channel correlations resulting from the camera colour filter array interpolation is examined and found to have a negligible magnitude relative to the chromatic aberration. Results with real data show how the removal of lateral chromatic aberration significantly improves the colour quality of the image.

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“…One obvious reason for this is the low availability of suitable instruments, but it is also the high level of resolution one needs to obtain to demonstrate the usefulness of aberration correction. The advantage of aberration correction is largest when imaging individual atoms [36], which is well illustrated by figure 7(a). Here different contrast transfer functions (CTFs) are shown for a conventional microscope.…”

Section: Phase Information Transfer Bymentioning

confidence: 87%

Advances in electron microscopy: A qualitative view of instrumentation development for macromolecular imaging and tomography

Schröder

2015

Archives of Biochemistry and Biophysics

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Breaking the spherical and chromatic aberration barrier in transmission electron microscopy

Cited by 117 publications

References 10 publications

In-Situ Reduction of Promoted Cobalt Oxide Supported on Alumina by Environmental Transmission Electron Microscopy

In-Situ Reduction of Promoted Cobalt Oxide Supported on Alumina by Environmental Transmission Electron Microscopy

Calibration and removal of lateral chromatic aberration in images

Advances in electron microscopy: A qualitative view of instrumentation development for macromolecular imaging and tomography

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