The Crunch homepage

The current version is 1.2, new options have been added since version 1.1

Solving the phaseproblem in crystallography is a necessary requirement for getting the molecular structure from your diffraction experiment. This is accomplished usually in one of two ways:

1. Direct methods, based on statistic relations between structurefactors
2. Patterson search methods.

Crunch is a direct methods program with a difference. Instead of using the usual triplet relation to determine the phases, Karle Hauptman matrices are used.
Please make your choice from the list given below.

• What's new? Information on recent developments.
• The manual, a fairly comprehensive description of the installation of Crunch, its use and requirements.
• Click here, to download this manual in postscript.
• FAQ's, frequently asked questions and some answers as well.
• Conditions for use.
• How to get Crunch. Click here to go to the download directory. You might want to try Crunch2, a version of Crunch aimed at the solving of difference structures in macromolecular crystallography. Crunch2 is available via the Crank webpage as a member of the Crank program system.
• References.
• A successful application.
• Links. Click here to look at some other sites, some of which have nothing to do with crystallography at all.

Automatic Determination of Crystal Structures using Karle-Hauptman Matrices.

R. de Gelder, R.A.G. de Graaff & H. Schenk,

Acta Crystallographica A49 (1993), 287-293.

            Dr. R.A.G. de Graaff  
            The Leiden Institute of Chemistry 
            Gorlaeus Laboratories  
            University of Leiden
            PO box 9502
            2300 RA Leiden
            The Netherlands
 
            E-mail: rag@chem.leidenuniv.nl