CRUNCH is a program for solving the phase problem in Single-Crystal X-ray diffraction. It consists of two unique procedures:

  • Direct methods, based on Karle-Hauptman Determinants
  • Automatic extension of partial structures, based on the R2-function

    Note: this URL is a copy of the original CRUNCH-page!

    The options

    CCP14 CRUNCH Tutorial by Lachlan Cranswick

    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.