Modern physics ** 7A60.24 ** Quantum effects

X-ray and electron diffraction

Optical analog of x-ray diffraction

Equipment:

• laser and support rod - shelf 12D
• I.C.E. optical transform slide - shelf 12D
• overhead transparency of the slide patterns- shelf 12D
• extension cord
• black cart and two cart-mounted support stands - main hallway

Warning: Be very careful with the laser. Always close the shutter when not in use.

Theory: The diffraction pattern observed when x-rays interact with crystals has an analog in optics : the Fraunhofer diffraction pattern seen when a laser beam is diffracted by a regular pattern embossed on a slide.

Description: Clamp two support rods to the cart, one at each end. Mount the laser on one, and place the slide in a holder on the other. Align everything so the beam passes through the slide and the pattern is seen on the screen.

The transparency should be shown so the students can see the different patterns on the slide; there are 8 different patterns available. The laser can be moved around the slide, going through the patterns one at a time.

Setup time: 20 minutes