 | 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 |
