The Crunch homepage
The current version is 1.5, new options have been added since version 1.2. The new version, 1.5, requires a Fortran90 compiler and supports OpenMp and GPU calculations. Version 1.5 is significantly faster, speed increases of more than a factor of 4 have been found.
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:
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.
- Direct methods, based on statistic relations between
- Patterson search methods.
Please make your choice from the list given below.
- What's new? Information on
- The manual, a fairly comprehensive
description of the installation of Crunch, its use and requirements.
- Click here, to download this manual
- 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.
A successful application.
- Links. Click here to look at some
other sites, some of which have nothing to do with crystallography
If you use Crunch, in any resulting publication please refer to:
- 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
University of Leiden
PO box 9502
2300 RA Leiden