Aberration-Corrected Analytical Transmission Electron by Susan Brooks(eds.)

By Susan Brooks(eds.)

The booklet is worried with the speculation, heritage, and sensible use of transmission electron microscopes with lens correctors which may right the results of round aberration. The ebook additionally covers a comparability with aberration correction within the TEM and purposes of analytical aberration corrected STEM in fabrics technological know-how and biology. This ebook is vital for microscopists eager about nanoscale and fabrics microanalysis in particular these utilizing scanning transmission electron microscopy, and comparable analytical thoughts corresponding to electron diffraction x-ray spectrometry (EDXS) and electron strength loss spectroscopy (EELS).Content:
Chapter 1 basic creation to Transmission Electron Microscopy (TEM) (pages 1–19): Peter Goodhew
Chapter 2 creation to Electron Optics (pages 21–38): Gordon Tatlock
Chapter three improvement of STEM (pages 39–53): L. M. Brown
Chapter four Lens Aberrations: prognosis and Correction (pages 55–87): Andrew Bleloch and Quentin Ramasse
Chapter five thought and Simulations of STEM Imaging (pages 89–110): Peter D. Nellist
Chapter 6 info of STEM (pages 111–161): Alan Craven
Chapter 7 Electron power Loss Spectrometry and effort Dispersive X?ray research (pages 163–210): Rik Brydson and Nicole Hondow
Chapter eight purposes of Aberration?Corrected Scanning Transmission Electron Microscopy (pages 211–240): Mervyn D. Shannon
Chapter nine Aberration?Corrected Imaging in CTEM (pages 241–261): Sarah J. Haigh and Angus I. Kirkland

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Extra info for Aberration-Corrected Analytical Transmission Electron Microscopy

Example text

There is some confusion in the literature about these terms; you are advised to read and consider the units of these quantities carefully. Beam damage of the specimen can occur by two dominant mechanisms – knock-on damage in which an atom or ion is displaced from its normal site, and ionisation damage (in some contexts called radiolysis) in which electrons are perturbed leading to chemical and then possibly structural changes. Both mechanisms are discussed by Williams and Carter (2009) and also Egerton et al.

Adjacent points in the image would each have a disc associated with them, so one measure of resolution would be how close the points can be brought together, while still being viewed as separate sources. 2 Airy ring, formed by white light travelling through a 1 mm diameter aperture. 3 Intensity distribution across an Airy ring. e. when the separation is the same as the radius of the Airy disc. This is known as the Rayleigh criterion. Clearly it may be possible to separate two distributions which are at a slightly closer distance, but the Rayleigh criterion does have the distinct advantage of simplicity of use.

For any signal from a specific feature within a TEM specimen, in order to detect or ‘see’ it in an image the contrast (strictly defined as {SF − SB }/SB where SF and SB are the signals from the feature and 12 ABERRATION-CORRECTED ANALYTICAL TEM the surrounding background respectively) needs to be greater (usually between three and five times greater) than the inherent noise level in the background signal, which in Poisson statistics is the square root of the number of counts. Thus detection and visualisation of a feature is highly dependent not only on the resolution but also critically depends on the contrast.

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