Virtual Labs

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Aim

Theory

Pretest

Procedure

Simulation

Posttest

References

Feedback

Interpretation of the Selected Area Diffraction Pattern

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Which of the following best describes the process of WBDF imaging in TEM?

a: Using the direct beam to form the image Explanation

Explanation

b: Aligning the electron beam with a zone axis Explanation

Explanation

c: Selecting a diffracted beam slightly off the Bragg condition to highlight defects Explanation

Explanation

d: Blocking all beams except for the scattered electrons Explanation

Explanation

What is the primary contrast mechanism in HAADF-TEM?

a: Electron absorption Explanation

Explanation

b: Electron diffraction Explanation

Explanation

c: Atomic number (Z) contrast Explanation

Explanation

d: Phase contrast Explanation

Explanation

An SADP with diffuse halos instead of discrete rings or spots suggests that the sample is:

a: Amorphous Explanation

Explanation

b: Single-crystalline Explanation

Explanation

c: Twin-structured Explanation

Explanation

d: Free of defects Explanation

Explanation

If an SADP exhibits splitting of diffraction spots, this is usually caused by:

a: Stacking faults Explanation

Explanation

b: Twinning Explanation

Explanation

c: High camera length Explanation

Explanation

d: Amorphous structure Explanation

Explanation

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