22 Questions
What can be inferred about the crystal lattice from the reflections in a diffraction image?
The crystal lattice is symmetrical
Which of the following best describes Miller indices?
A series of integers that describe the orientation of a crystal face with respect to the axes
What does the general form of Miller index (h, k, l) represent?
The intercepts of the crystal face with the edges of the unit cell
What is the unit cell defined as?
The smallest repeating unit with the full symmetry of the crystal structure
During a crystallography experiment, what is the purpose of integration?
To account for errors that may occur during the experiment
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
Which of the following errors can occur during a crystallography experiment and need to be accounted for during integration?
All of the above
Which of the following describes the purpose of scaling in a diffraction experiment?
To combine the integrated values of different images
What does the intensity of a reflection in a diffraction image provide information about?
The structure factor
What is the relationship between intensity and amplitude in a diffraction experiment?
Intensity is the square root of amplitude
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
From an experimental point of view, how is a crystal structure defined?
By the number of spots in the diffraction pattern
What do the structure factors represent in crystallography?
The diffracted waves
Which type of information is lost during data collection in x-ray crystallography?
Phase
What can be easily calculated from the intensity of a reflection in x-ray crystallography?
Structure Factor
What is the main challenge in x-ray crystallography regarding the phase of the electromagnetic waves?
The phase information is lost during data collection
Which type of information is obtained from the intensity of the reflections (spots) in diffraction images?
Content of the crystal lattice
What does the second form of information obtained from the diffraction images lack?
Phases of the crystal lattice
What do the reflections (spots) in the diffraction images reveal about the crystal lattice?
Crystal lattice and symmetry
Diffraction images reveal the ______ of the crystal lattice
geometrical arrangement
The second form of information obtained from the diffraction images lacks the ______
phases
The intensity of a reflection in a diffraction image provides information about the ______ of the crystal lattice/array
content
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
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.
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