ch 12

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Questions and Answers

What can be inferred about the crystal lattice from the reflections in a diffraction image?

The crystal lattice is amorphous

The crystal lattice is not present

The crystal lattice is symmetrical (correct)

The crystal lattice is asymmetrical

Which of the following best describes Miller indices?

A series of integers that describe the color of a crystal face

A series of integers that describe the orientation of a crystal face with respect to the axes (correct)

A series of integers that describe the shape of a crystal face

A series of integers that describe the size of a crystal face

What does the general form of Miller index (h, k, l) represent?

The color of the crystal face

The shape of the crystal face

The intercepts of the crystal face with the edges of the unit cell (correct)

The size of the crystal face

What is the unit cell defined as?

The smallest repeating unit with the full symmetry of the crystal structure Signup and view all the answers

During a crystallography experiment, what is the purpose of integration?

To account for errors that may occur during the experiment Signup and view all the answers

What is the significance of the intensity value (I) and error in intensity (σI) obtained during integration?

They are used to exclude wrong values from the analysis Signup and view all the answers

Which of the following errors can occur during a crystallography experiment and need to be accounted for during integration?

All of the above Signup and view all the answers

Which of the following describes the purpose of scaling in a diffraction experiment?

To combine the integrated values of different images Signup and view all the answers

What does the intensity of a reflection in a diffraction image provide information about?

The structure factor Signup and view all the answers

What is the relationship between intensity and amplitude in a diffraction experiment?

Intensity is the square root of amplitude Signup and view all the answers

Which waves leave their mark on a photographic plate or detector in the form of well-defined spots that form the diffraction pattern?

Diffracted waves Signup and view all the answers

From an experimental point of view, how is a crystal structure defined?

By the number of spots in the diffraction pattern Signup and view all the answers

What do the structure factors represent in crystallography?

The diffracted waves Signup and view all the answers

Which type of information is lost during data collection in x-ray crystallography?

Phase Signup and view all the answers

What can be easily calculated from the intensity of a reflection in x-ray crystallography?

Structure Factor Signup and view all the answers

What is the main challenge in x-ray crystallography regarding the phase of the electromagnetic waves?

The phase information is lost during data collection Signup and view all the answers

Which type of information is obtained from the intensity of the reflections (spots) in diffraction images?

Content of the crystal lattice Signup and view all the answers

What does the second form of information obtained from the diffraction images lack?

Phases of the crystal lattice Signup and view all the answers

What do the reflections (spots) in the diffraction images reveal about the crystal lattice?

Crystal lattice and symmetry Signup and view all the answers

Diffraction images reveal the ______ of the crystal lattice

geometrical arrangement Signup and view all the answers

The second form of information obtained from the diffraction images lacks the ______

phases Signup and view all the answers

The intensity of a reflection in a diffraction image provides information about the ______ of the crystal lattice/array

content Signup and view all the answers

Study Notes

Diffraction Image Reflections

Two types of information can be extracted from the reflections (spots) in diffraction images
The geometrical arrangement of the reflections provides information about the crystal lattice and its symmetry
The intensity of the reflections provides partial information about the content of the crystal lattice/array
The intensity information is incomplete, lacking the phases

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Description

Test your knowledge on indexing diffraction images and learn about the valuable information provided by the geometrical arrangement and intensity of reflections. Explore crystal lattice, symmetry, and content analysis in this informative quiz.