STRUCTURAL INVESTIGATIONS ON MICROCRYSTALS WITH A HIGHLT COLLIMATED SYNCHROTRON BEAM. A.Bram, S. Fiedler, C. Riekel, European Synchrotron Radiation Facility, BP 220, 38043 Grenoble, France

A endstation for single crystal microcrystallography has been installed at the ESRF microfocus beamline [1]. A monochromatic beam from an undulator is demagnified by an ellipsoidal mirror. Background reduction is effected by a post collimator. A liquid N₂ cooled CCD detector with converter screen and optical demagnification is used for data collection on a K-goniometer. In order to minimize the influence of air scattering the whole goniometer can be placed in a vacuum vessel. First experiments have been performed on inorganic crystals, proteins and small organic fibres. The present setup will be shown together with the results of selected experiments.

[1] P. Engstroem, S. Fiedler, C. Riekel, Rev. Sci. Instrum., 66(2), 1348 - 1350 (1995)