This custom-built instrument is an intermediate small angle x-ray spectrometer (SAXS) and overlaps with the ultra-small angle spectrometer. The instrument is primarily used for probing the structure of polymers, biomaterials, and nanomaterials in the lengthscale range between 10 Å – 100 Å. Both oriented and unoriented samples in the form of solid powder, liquid solution, and free-standing or supported thin films can be measured. The signal for unoriented samples is enhanced by the use of a two-dimensional x-ray detector.

Two-Circle Diffractometer

Diffraction pattern collected on 2-C

X-ray source: 18 kW Rigaku rotating anode (Cu anode, wavelength = 1.54 Å)
Monochromator: bent graphite
Beam size at sample position: 0.8 mm x 0.8 mm
Detector: 18 cm diameter Mar image plate detector
Optics: 4 sets of Huber slits (two sets motorized) for setting resolution
Flight paths: evacuated both in the incident and diffracted beam
Goniometer: large open Huber 2-circle
Sample stage: motorized X-Y-Z
Automated sample changing: up to 14 x-ray capillaries with full x-y-z positioning for each sample
Filter inserter: 3 filters and 1 shutter
Flux: ~ 10⁷photons/second
Typical range of lengthscale probed: 10 Å – 100 Å
Speciment-to-detector distance: changeable between 30 cm – 80 cm
Computer: Linux PC
Software for data collection: SPEC
Software for data processing: MARVIP and FIT2D

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