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Materials Science 142
Applications of Diffraction Techniques

Laboratory Exercises 2: Plane Group Symmetry

Assigned: 4/12/06
Due:4/19/06, 5pm

Goal: Determine the symmetries present in a 2-dimensional pattern; identify an appropriate unit cell. Seven patterns are to be analyzed.

1. Identify rotation axes. Note these on your pattern using the appropriate symbol.
2. Identify mirror planes. Draw these as solid blue lines.
3. Identify glide planes. Draw these as dotted red lines.
4. Outline the unit cell in black. Indicate the number of lattice points per unit cell.

Details:

Make sure your patterns are relatively neat and legible. If you were not in lab, or would like to get additional copies of the 2-d patterns, you can download them here.

Additional Homework Problems:

Textbook Chapter 1: #11, #14

2-D Patterns

pattern 1
pattern 2
pattern 3
pattern 4
pattern 5
pattern 6
pattern 7

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Last modified: April 14, 2006