<i>Experimental High-Resolution Electron Microscopy</i>

Spence, J. C. H.; Crewe, A. V.

doi:10.1063/1.2914772

Cited by 304 publications

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“…If we assume that the weak-phase object approximation holds, which is usually a reasonable approximation for single atoms (Spence, 1988), the exit wave function for an atom located at (projected) position (b x , b y ) is given by…”

Section: Exit Wavementioning

confidence: 99%

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How to optimize the design of a quantitative HREM experiment so as to attain the highest precision

1999

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SummaryUsing parameter estimation theory, an expression is derived for the maximum precision with which the position of a single atom can be estimated from high resolution transmission electron microscopy images. This expression, being a complicated function of the object as well as of the microscope parameters and the electron dose, can be used to optimize the design of an HREM experiment so as to attain the highest precision.

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Section: Exit Wavementioning

confidence: 99%

“…The damping envelope function, incorporating the effect of temporal incoherence due to chromatic aberration (Spence, 1988), reads…”

Section: Transfer Functionmentioning

confidence: 99%

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How to optimize the design of a quantitative HREM experiment so as to attain the highest precision

1999

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“…The sample was studied by electron-optical and HREM techniques (Spence, 1981). The preparation of the electron-microscopy samples has previously been described (Lundberg & Sundberg, 1986).…”

Section: Methodsmentioning

confidence: 99%

Studies of K₃Nb₇O₁₉ by high-resolution electron microscopy and X-ray powder diffraction

Sundberg¹,

Lundberg²

1987

Acta Crystallogr Sect B

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An idealized structure model of the K3Nb7Ol9 compound has been deduced from high-resolution electron micrographs. For simplicity the structure was derived in a pseudo-monoclinic system with triclinic symmetry (space group P1) and unit-cell dimensions a = 13.777 (2), b =6-431 (1), c= 18.897 (6) A, a-~ 90, /3 = 98.06 (2) and y -~ 90 °, V = 1657.7 A 3, Z = 4. It has been verified both by simulated image calculations in two projections and by X-ray powder diffraction studies. The structure consists of a threedimensional framework which is built up of pairs of NbO6 octahedra having one edge in common in such a way that the structure can be described by means of{011} crystallographic shear in the ReO3 type structure. The pairs are linked by edge and corner sharing as in the {120} crystallographic-shear (CS) structure M702o. Two kinds of tunnels are formed, in which the K atoms are located. The structure thus independently derived agrees with that recently published by triclinic. We have refined the cell parameters given in that article: a = 14.1282 (9), b--9.9369 (9), c = 6.4553 (6) A, a= 106.44(1), /3=95.856(6) and y= 97.30 (1) °, V= 853.05 ~3, Z =2, M~ = 1071.64, and Dx = 4.17 g cm -3. However, in this paper the structure is described in a different manner and discussed in relation to neighbouring compounds of this system.

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“…If the diffraction experiments are performed in an electron microscope, an electron micrograph can be obtained from crystalline samples using a subset of diffracted beams. Essentially, an electron micrograph is an interference pattern formed by the selected subset of diffracted beams (Cowley, 1975;Spence, 1988). A Fourier transform of the electron micrograph then provides phases for the subset of low-resolution diffracted beams used in forming the image.…”

Section: V(r) = Zvgexp(ig'r)mentioning

confidence: 99%

On the validity of the direct phasing and Fourier method in electron crystallography

Peng¹,

Wang²

1994

Acta Cryst Sect A

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Experimental High-Resolution Electron Microscopy

Cited by 304 publications

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How to optimize the design of a quantitative HREM experiment so as to attain the highest precision

How to optimize the design of a quantitative HREM experiment so as to attain the highest precision

Studies of K₃Nb₇O₁₉ by high-resolution electron microscopy and X-ray powder diffraction

On the validity of the direct phasing and Fourier method in electron crystallography

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Experimental High-Resolution Electron Microscopy

Cited by 304 publications

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How to optimize the design of a quantitative HREM experiment so as to attain the highest precision

How to optimize the design of a quantitative HREM experiment so as to attain the highest precision

Studies of K3Nb7O19 by high-resolution electron microscopy and X-ray powder diffraction

On the validity of the direct phasing and Fourier method in electron crystallography

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Studies of K₃Nb₇O₁₉ by high-resolution electron microscopy and X-ray powder diffraction