Contact: Yu-Sheng Chen, +1 630.252.0471 or +1 630.252.0445, yschen@cars.uchicago.edu

ChemMatCARS has implemented a "rapid setup" crystallography facility that allows us to rapidly switch operation to the single-crystal instrument. The diffractometer is pre-aligned internally and can be moved into the beam when required. This flexibility allows us to take advantage of beam availability at short notice. Thiscapability has been used extensively in user experiments.

In February 2008, we updated this setup by integrating a fast-readout Bruker APEXII detector with ChemMatCAR's new Bruker D8 diffractometer. The new equipment has been commissioned successfully.

General user proposals are being accepted in areas such as

• resonance diffraction
• microcrystallography
• high-resolution charge density studies
• high-pressure studies

• SCrAPS Overview (pdf document - 172K)
• SCrAPS Page (Indiana University Molecular Structure Center)

• High spatial resolution ~ up to 2.1 Å^-1.
• Energy Range: 6 - 32 keV (2.0 - 0.38 Å)
• Max. Beam Size: 500 x 500 µm (3 x 1012 ph/s/0.1% bandwidth)
• Min. Beam Size: 80 x 80 µm
• Diffractometer Type: Bruker D8 fixed-chi with 2θ detector rotation
• Sphere of Confusion: Currently < 5 µm radius
• Software: APEXII suite
• Sample Environment:
  • Cryojet N2 cold stream (90 - 300 K temperature range)
  • Open-flow liquid He cryostat (15 - 70 K temperature range)
• Bruker APEXII detector (62 x 62 active area) with four ports readout
  • Readout with 8 x 8 binning ~ 1 s (uncorrelated)
  • Readout with 4 x 4 binning ~ 1.5 s (uncorrelated