is a crystallographic package for crystal structure determination from single crystal diffraction data.The first version of the Caos program was written at the early years of the 70's. (Cerrini S. & Spagna R. (1977) Crystallographic software for a mincomputer, IV Eur. Crystallgr.Meet., Oxford, UK, Abstract A-212). At the present, Caos covers most of the crystallographic calculation: data reduction, intensity statistics, Fourier and Patterson synthesis, automatic Patterson solution, peaks interpretation, structure factor and least squares calculation with user defined blocked matrix, geometrical calculation, molecular display, publication tables, CIF files. Space group restrictions are handled automatically and it is possible introduce restraints in the refinement and many weighting schemes are available. Furthermore, hydrogen atoms can be calculated from model.

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