wiki:WikiStart

Version 12 (modified by toby, 10 years ago) (diff)

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GSAS-II Home

This page will eventually describe the code developed in the GSAS-II (aka GSAS-2 or GSAS2) 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 ‚Äčhttps://subversion.xor.aps.anl.gov/pyGSAS/trunk/

At present GSAS-II can be used for processing of area detector data, peak fitting, auto-indexing, Pawley and Rietveld fitting. Many of the nice feature of GSAS are present and some things work much better than in GSAS, but other features are yet to come. At this point only x-rays are implemented. There is no documentation other than the examples below, but the GUI is intended to be self-documenting. The code is changing on a regular basis, so expect things to break from time to time.

GSAS-II User Documentation

Installation instructions:

Demonstration Exercises:

Reusable Modules

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.