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Advance Imaging in Transmission Electron Microscopy

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In Dark Field TEM, the image is formed by using?

a: The direct beam Explanation

Explanation

b: The diffracted beams Explanation

Explanation

c: Both direct and diffracted beams Explanation

Explanation

d: Secondary electrons Explanation

Explanation

Which of the following components is adjusted to obtain a Dark Field image in TEM?

a: Electron gun Explanation

Explanation

b: Objective lens Explanation

Explanation

c: Aperture Explanation

Explanation

d: Fluorescent screen Explanation

Explanation

In Dark Field TEM, why are diffracted beams selected instead of the direct beam?

a: To observe defects in the crystal structure Explanation

Explanation

b: To increase brightnessy Explanation

Explanation

c: To reduce image noise Explanation

Explanation

d: To increase magnification Explanation

Explanation

In Centered Dark Field (CDF) imaging, the selected diffraction spot is positioned:

a: At the center of the optical axis Explanation

Explanation

b: Slightly off the optical axis Explanation

Explanation

c: Outside the objective aperture Explanation

Explanation

d: Near the edge of the condenser lens Explanation

Explanation

The main advantage of WBDF over conventional dark field imaging is:

a: Higher electron dose for imaging Explanation

Explanation

b: Improved contrast and spatial resolution for defects Explanation

Explanation

c: Ability to image amorphous materials Explanation

Explanation

d: Suppression of electron scattering Explanation

Explanation

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