X-ray
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X-ray

Lab Guide: Zafra Stein, room 418 Orenstein Bldg., Tel:640-6433/9965

The motivation of the lab is to familiarize the student with the diffraction phenomena from crystals and utilizing it in obtaining the periodicity of the crystal.

The first experiment includes diffraction of a laser beam (He/Ne) from a two-dimensional lattice, in order to demonstrate the diffraction of electromagnetic waves and the reciprocal relationship between the periodic distances in the lattices and the dimensions obtained in the diffraction image.
The second experiment is a diffraction of X-rays from different crystals. According to the results obtained we will calculate the typical dimension of the unit cell of each of the materials.
As an option we will see how a computer program (INDEX) calculates the dimensions of the cell and the indices of the lattice planes, according to the coordinates of the diffraction spots, obtained in the image.
The last part of the experiment uses a powder diffractometer, in which we will radiate different powders with X-rays, and receive the typical diffraction patterns ("finger prints") for each of the materials, on a graph displaying the intensity as a function of the diffraction angle.
Background material is located in the following sources:
1. Attached pages in your lab manual
2. Web site