Central Facilities
Small Angle X-ray Scattering (SAXS) Spectrometer

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.

Front view of the SAXS instrument

A SAXS pattern of a surfactant
templated mesoporous silicate

Specifications

X-ray Source

Fine focus (0.2 mm) Rigaku rotating anode generator

Wavelength

1.54 Å

Monochromator

Osmic Confocal Maxflux double focusing multilayer mirror

Bruker HI-STAR multiwire area detector, 11 cm dia. active area
1024 x 1024 16 bit image.

Beam Size at Sample

~ 1 mm x 1 mm

Source to Sample Distance

2 meter, variable by changing flight tubes

Sample to Detector Distance

1.5 meter, variable by changing flight tubes

Q range (typical)

0.01 – 0.12 (Å-1)

Total instrument length

3.5 meter

X-ray Optics

3 sets of motorized vaccuum slits + 2 sets of manual slits

Flight Paths

Evacuated aluminum pipes

Sample Chamber

In vacuum or atmosphere, with motorized x-y-z translations and rotation

User Interface

Bruker SAXS software and SPEC

Help Files

Click here to sign up for time on the SAXS instrument (authorized users only)