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Designed and constructed by researchers
in the MRL X-ray Facility, the new SAXS spectrometer became available to users
in fall of 2000. By utilizing a high intensity x-ray source, state-of-the-art
x-ray optics and detectors, the SAXS instrument provides cutting edge
capabilities for probing large lengthscale structures such as polymers,
biological macromolecules, meso- and nano-porous materials, and molecular
self-assemblies. Background scattering is minimized through the use of a
3-meter fully evacuated flight path (including sample chamber) and vacuum
compatible motorized slits. The spectrometer has a 600 angstrom small angle
resolution in the typical set up, but can be reconfigured for different
resolution due to its modular design and construction.
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Front view of the SAXS instrument
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A SAXS pattern of a surfactant
templated mesoporous silicate
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X-ray Source
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Fine focus (0.2 mm) Rigaku rotating
anode generator
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Wavelength
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1.54 Å
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Monochromator
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Osmic Confocal Maxflux double focusing
multilayer mirror
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Bruker HI-STAR multiwire area
detector, 11 cm dia. active area
1024 x 1024 16 bit image.
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Beam Size at Sample
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~ 1 mm x 1 mm
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Source to Sample Distance
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2 meter, variable by changing flight
tubes
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Sample to Detector Distance
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1.5 meter, variable by changing flight
tubes
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Q range (typical)
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0.01 – 0.12 (Å-1)
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Total instrument length
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3.5 meter
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X-ray Optics
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3 sets of motorized vaccuum slits + 2
sets of manual slits
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Flight Paths
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Evacuated aluminum pipes
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Sample Chamber
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In vacuum or atmosphere, with
motorized x-y-z translations and rotation
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User Interface
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Bruker SAXS software and SPEC |
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