FIRST RESULTS FROM THE NEW DARESBURY CHEMICAL/MATERIALS SINGLE-CRYSTAL DIFFRACTION BEAM-LINE 9.8. William Clegg Department of Chemistry, University of Newcastle, Newcastle upon Tyne NE1 7RU and Daresbury Laboratory, Daresbury, Warrington WA4 4AD, U.K.

At the time of abstract submission the new high-flux single-crystal diffraction station at Daresbury is almost ready for commissioning. It is designed with a horizontally focussing triangular monochromator and vertically focussing mirror (constrained by the available space close to the tangent point on the original Wiggler of the SRS), and is expected to deliver up to 10¹³ photons/second at the sample. A wavelength range of 0.3-1.5Å is accessible.

The station is equipped with a range of goniometer and detector systems. An Enraf-Nonius CAD-4 diffractometer provides for serial measurement of individual reflections. A MARresearch image plate is available, and the addition of a Siemens SMART CCD system is currently being considered, following tests carried out at ESRF. Facilities for low-temperature data collection are already in place (Oxford Cryostream), and equipment for high temperature and high pressure are being developed.

Some results from five months of commissioning use will be presented. These will include a wide variety of samples provided by many research groups supporting the funding application for the station, working in diverse fields of chemistry and materials science. Commissioning will include an assessment of the relative merits of the available goniometer/detector systems in a synchrotron environment.