Read e-book online Aberration-corrected Analytical Electron Microscopy (RMS - PDF

By Rik Brydson

ISBN-10: 0470518510

ISBN-13: 9780470518519

The ebook is anxious with the idea, history, and functional use of transmission electron microscopes with lens correctors which can right the consequences of round aberration. The ebook additionally covers a comparability with aberration correction within the TEM and purposes of analytical aberration corrected STEM in fabrics technology and biology. This ebook is vital for microscopists inquisitive about nanoscale and fabrics microanalysis specifically these utilizing scanning transmission electron microscopy, and similar analytical options equivalent to electron diffraction x-ray spectrometry (EDXS) and electron power loss spectroscopy (EELS).

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Additional resources for Aberration-corrected Analytical Electron Microscopy (RMS - Royal Microscopical Society)

Example text

This expression implies strongly forward-peaked scattering in which the scattering is very much more likely to be through a very small angle. However, Rutherford scattering ignores screening of the nucleus by localised electrons and overestimates scattering at low angles. It also gives an infinite cross section if integrated over all angles! 2) Here γ (where γ = [1 − v 2 /c2 ]−1/2 ) is the relativistic factor for the electron velocity (v) relative to the speed of light (c), Z is the atomic number, a0 is the Bohr radius, q is the magnitude of the scattering vector and k = |k| is the magnitude of the wave vector of the incident electron (k = 2π/λ for an electron of wavelength λ, as defined above).

34 ABERRATION-CORRECTED ANALYTICAL TEM The CTEM, on the other hand, works on a totally different principle. 12). This is termed the CTEM operating in image mode. However, if a parallel beam of electrons is incident on the sample, then beams of electrons scattered in different directions by the sample will be brought to point focii in the back focal plane of the objective lens, giving rise to a diffraction pattern which can also be projected onto the viewing screen or detector array by changing the excitation of the projector lenses after the objective lens and operating the CTEM in diffraction mode.

Several of these parameters are very difficult to measure accurately, so simulations are often run for a range of thicknesses and a range of defoci, while the corresponding experimental images are collected as a through-focal series. Despite this complexity many structures have been solved or confirmed by the use of such simulations. High resolution simulations, for CTEM or STEM, adopt one of two approaches, based on Bloch wave propagation or the multislice principle. Because Bloch wave calculations require greater processing power, and are in some ways less flexible, multislice programs now dominate the field.

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Aberration-corrected Analytical Electron Microscopy (RMS - Royal Microscopical Society) by Rik Brydson

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