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Intermediate Small Angle Diffractometer (2-Circle) |
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.
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Two-Circle Diffractometer
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Diffraction pattern collected on 2-C
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- 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
- Data collection
- Data processing
