Advanced Photon Source

A U.S. Department of Energy, Office of Science,
Office of Basic Energy Sciences national synchrotron x-ray research facility

GSAS/EXPGUI demo: CW Neutron Alumina Example

Presentation Goal

• Show how to set up and perform a Rietveld refinement with GSAS using the EXPGUI graphical user interface.
• Format: a RealPlayer video showing the computer screen to accompany a set of web pages (that are also available as a .pdf file).

Tutorial Outline

1. Introduction
2. Create a GSAS Experiment File
3. Adding a phase
4. Specifying Powder Diffraction Data (Adding a Histogram)
5. Changing the Background Function
6. Initial Fitting: Refine Scale Factor and Background
7. Plotting the Initial Fit
8. Fitting the Unit Cell
9. Fitting the Diffractometer Zero Correction
10. Initial Fitting of Profile Parameters
11. Group U_iso parameters & Refine coordinates and Overall U_iso
12. Finishing Up

Links

• Tutorial web pages
• Tutorial as a 32 page .pdf document
• FlashMovie presentation with index (best viewed with 1024x768 or better screen resolution)
• FlashMovie file (800x600 pixels)
• APS Powder diffraction crystallography instructional materials overview