Jerome B. Cohen X-ray Diffraction Facility @ Northwestern University

FUNCTION: The primary function is to provide general-purpose x-ray equipment for diffraction and fluorescence studies. The facility can also make accommodations for non-routine experiments such as special attachments for high and low temperatures, vacuum or protective atmospheres, monochromators, special detectors, etc. Examples of current measurements are: powder diffraction, single-crystal diffraction, thin-film reflectivity, thin-film diffraction, crystal truncation rod scattering, small angle scattering, Laue diffraction, wave-length dispersive x-ray fluorescence, x-ray standing waves and high-resolution x-ray diffraction. EQUIPMENT: There are presently fourteen experimental x-ray stations available, five of which have rotating anode sources. 1. Rigaku AXT-G Thin-film Diffraction Workstation: A high intensity 18kW copper x-ray source is coupled to a multilayer mirror. The system has selectable x-ray optical configurations suitable for work with single crystal, thin-film or poly-crystalline film samples. Also supported are grazing incidence and in-plane diffraction geometries. Other features are the 5-axis goniometer with several 4-crystal monochrometers that couple to the multilayer mirror. 2. 18kW Rigaku: High-resolution 4-circle diffractometer with Osmic Max-Flux multi-layer mirror, coupled to Si or Ge monochromator, SPEC software control, high-count rate scintillation detector, automated beam attenuator and multi-channel analyzer fluorescence spectroscopy system. 3. 12kW Rigaku: Medium resolution 4-circle diffractometer with SPEC software control and automated beam attenuator. 4. 18kW Rigaku: 2-circle diffractometer with Osmic Max-Flux multi-layer mirror, high-count rate scintillation detector and multi-channel analyzer fluorescence system. 5. Bruker S4: Automated wavelength dispersive x-ray fluorescence (WD-XRF) system. 6. Scintag XDS2000: Automated diffraction system with four-circle pole-figure and residual stress device, thin film diffraction attachment and solid-state detector. 7. Rigaku Dmax: Automated powder diffraction stations featuring Jade Analysis software. 8. PC data analysis workstation: JADE powder diffraction analysis software, CaRine diffraction simulation software, JCPDS powder diffraction database and Laue analysis software. 9. Blake High Resolution tangential goniometer: 5-Bounce high-resolution rocking curve-scan system. Sealed tube x-ray source. 10. Small-angle scattering system: Micro-beam rotating anode, Bruker Hi-Star 2-dimesional detector, elevated temperature attachment and GADDS, software. (q=0.1 ?? -1) 11. Rigaku S-MAX 3000 High Brilliance SAXS System (Available Oct 2007) Rotating anode with multilayer mirror, 2-D wire detector, SAXS-GISAXS, WAXS capabilities including high temperature. q(min) = 0.04 ?? -1 OTHER AVAILABLE EQUIPMENT: 1. A variety of x-ray anode targets and source sizes to accommodate the four high intensity rotating anode generators and the nine sealed tube x-ray generators. 2. Various Si, Ge, Graphite and LiF crystals and multi-layer mirrors are available for incident or diffracted beam monochromators. 3. Environmental chambers for vacuum, atmosphere, low temperature (>2 K) or high temperature (< 2300 K) operation. 4. Six solid-state detectors with associated electronics, SCA's and MCA's. 5. Three gas-filled 1-dimesional linear position sensitive detectors. 6. Variety of film cameras: Debye-Scherrer, Laue, rotating crystal, cylindrical, topographic, Buerger precession, Guinier, high pressure and darkroom facilities. COMPUTERS and SOFTWARE : All of the x-ray stations operate via networked PC's with software that allows for control via stepping motors and data collection via counters. A networked printer is available. ICDD database, JADE diffraction analysis, CaRine crystal builder simulation and Laue diffraction software packages are available. SPEC and CPLOT are available on three of the stations.