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Direct Methods for Images Interpretation

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Author information

Authors and Affiliations

  1. Electron Microscopy for Materials Science (EMAT), University of Antwerp, Antwerp, Belgium

    Dirk Van Dyck & Sandra Van Aert

Authors
  1. Dirk Van Dyck
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  2. Sandra Van Aert
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Corresponding author

Correspondence to Dirk Van Dyck .

Editor information

Editors and Affiliations

  1. University of Connecticut, Storrs, Connecticut, USA

    C. Barry Carter

  2. Ohio State University, Columbus, Ohio, USA

    David B. Williams

Appendix

Appendix

10.1.1 People

Severin Amelinckx was born on October 30, 1922 and died in Antwerp on February 22, 2007. He was a pioneer in applying TEM to the study of defects in crystals and led a prestigious group in applying not only HRTEM to crystals but particularly in using diffraction geometry to understand contrast in TEM images.

Pierre Delavignette was born on July 3, 1931 and died on December 29, 2011, again in Belgium. He worked closely with his Ph.D. advisor, Professor Amelinckx, throughout his life doing classic work on multi-layer graphene (then known as graphite) and many other layer materials.

10.1.2 Self-Assessment Questions

Q10.1:

How do we define the term ‘direct methods ’?

Q10.2:

How does the PSF relate to resolution and how does it compare to the ‘impulse-response function’?

Q10.3:

What is delocalization in relation to an image? (You may find Chap. 28 of W&C helpful.)

Q10.4:

Where did you see channeling in W&C?

Q10.5:

How can we have an extinction distance along a single column of atoms?

Q10.6:

What is an eigenstate of a Hamiltonian ? (You may need to look back at your physics books.)

Q10.7:

What is a ∑ = 5 gb?

Q10.8:

Where did you first encounter Argand diagrams?

Q10.9:

If we go to all this trouble to obtain pm precision, what is our precision usually in HRTEM?

Q10.10:

Express the term ‘goodness of fit’ in a different way that sounds like better grammar and explain why we say ‘goodness of fit’.

Q10.11:

We say “invert, or equivalently, undo”. Clarify what we mean by ‘equivalently’.

Q10.12:

We say “the difference in averaged atomic number is only 3”. Explain.

Q10.13:

So what exactly do we mean by the term ‘statistical parameter estimation theory’?

Q10.14:

We want to ‘determine the chemical composition … and count atoms’. Why both?

10.1.3 Text-Specific Questions

T10.1:

Discuss the concept of a Wiener filter, using the literature for more details.

T10.2:

What do we mean by the term ‘coherent imaging’ and how would we describe this mathematically?

T10.3:

Is there any connection between dynamical extinction described here and the extinction distance discussed in Chaps. 15 and 25 of W&C.

T10.4:

Elaborate on the use of ‘model-based, structure determination’.

T10.5:

Would HAADF STEM or phase-contrast TEM be more affected by channeling?

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Van Dyck, D., Van Aert, S. (2016). Direct Methods for Images Interpretation. In: Carter, C., Williams, D. (eds) Transmission Electron Microscopy. Springer, Cham. https://doi.org/10.1007/978-3-319-26651-0_10

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