Department of Physics
University of Toronto
LAUE: Laue Back-Reflection of X-Rays
X-rays scattering is one of the most powerful methods used worldwide to understand the structure of materials, from high temperature superconductors to proteins and other macromolecules.
This experiment primarily looks at crystal planes in single crystals using a technique involving constructive interference of X-rays.
Max von Laue won the Nobel Prize in Physics
in 1914 "for his discovery of the diffraction of X-rays by crystals". Other Nobel Prizes involving crystallography include Lawrence Bragg and William Bragg (Physics 1915), Peter Debye (Chemistry 1936), Watson, Crick, and Wilkins (Medicine 1962), Dorothy Hodgkin (Chemistry 1964), Bertram Brockhouse and Clifford Shull (Physics 1994), Ramakrishnan, Steitz, and Yonath (Chemistry 2009), Dan Shechtman (Chemistry 2011), and many more
(The lab is currently located in MP226; last write-up revision: May 2016.)
- – Current (September 2018) instructions for developing X-ray film in PDF Format or
Microsoft Word Format.
- – Analysis software:
- Laue_Spot_Identify.py is a python script for cubic crystal lattices that given a sufficient number of spot positions on a planar Laue image, can determine their hkl indices. How to use Laue_Spot_Identify is explained in its comments.
- Laue_Spot_Patterns.py is a python script that will plot spot patterns for simple cubic, face-centred cubic, and body-centred cubic crystal lattices. How to use Laue_Spot_Patterns is explained in its comments. Improvements or modifications are welcome.
- QLaue (for Windows or Mac)
simulates back reflection Laue diffraction images, allows rotations and overlaying actual Laue images. Some help with QLaue is found in QLaue_Notes, available in either doc or pdf format.
- MATLAB code written by student David Wong projects a picture of Laue spots as if the user is the crystal looking at its reflection.
- – Material and crystal properties:
Last updated on 18 September 2018