GSAS-II Home

This page will eventually describe the code developed in the GSAS-II project. GSAS-II is an open source project to augment and eventually replace GSAS. Both packages address all types of crystallographic studies, from simple materials through macromolecules, using both powder and single-crystal diffraction with both x-ray and neutron probes. Measurements can be angle- or energy-dispersive (such as TOF). At present, code is being developed for precursor steps in diffraction analysis that cannot be addressed in GSAS-II, such as data reduction, peak analysis, indexing and structure solution. Structure refinement will be addressed at a later time. The source code can be found at ​https://subversion.xor.aps.anl.gov/pyGSAS/trunk/

GSAS-II User Documentation

watch this space

Reusable Modules

GSASIIspc: Space group interpretation code

GSAS-II Unit Tests

The hope is that all sections of GSAS-II code will have unit tests, following the outline defined here.

GSAS-II Project tracking

Updates to the source code can be followed using the Trac tool at this website. The Tickets and Roadmap features are not in use. The Trac web pages, such as this one are editable, this means that you can modify the contents of this page simply by using your web-browser. Simply click on the "Edit this page" link at the bottom of the page. See the TracGuide as a starting point with Trac. WikiFormatting will give you a detailed description of available Wiki formatting commands;

For a complete list of GSAS-II wiki pages, see TitleIndex.