A custom-built small-to-wide angle x-ray spectrometer with a large Huber 4-circle goniometer capable of accommodating large sample chambers (e.g. temperature and humidity ovens), the 4-circle diffractometer is used routinely for investigation of polymeric and biological materials, liquid crystals, and polycrystalline materials.The 4-circle is equipped with an OSMIC double focusing multiplayer monochromator and a MAR 345 mm diameter image plate detector.

Features

• X-ray source: 18 kW Rigaku rotating anode x-ray generator (Cu anode, wavelength = 1.54 Å)
• Monochromator: OSMIC Confocal Maxflux focusing multilayer mirror
• Beam size at sample: 1 mm x 1 mm
• Optics: 2 sets of Huber slits for adjusting resolution and beam size
• Flight tubes: evacuated
• Detector: MAR345 Image Plate Area Detector
• Goniometer: large Huber 4-circle
• Sample stage: motorized X-Y-Z stage
• Flux: ~ 10⁸ photons/second
• Typical range of length scale probed: 2 Å – 200 Å
• Computer: Linux PC
• Software for data collection: SPEC
• Software for data processing: CPLOT and Fit2D

Example: X-ray Diffraction Data from liquid crystal sample W470