Study of a large variety of samples ranging from liquids, solutions, glasses, polymers, and nanocrystalline materials to long-range-ordered crystals.
NOMAD is a high-flux, medium-resolution diffractometer that uses a large bandwidth of neutron energies and extensive detector coverage to carry out structural determinations of local order in crystalline and amorphous materials. It enables studies of a large variety of samples ranging from liquids, solutions, glasses, polymers, and nanocrystalline materials to long-range-ordered crystals. The enhanced neutron flux at SNS, coupled with the advanced neutron optics and detector features of NOMAD, allows for unprecedented access to high-resolution pair distribution functions, small-contrast isotope substitution experiments, small sample sizes, and parametric studies.
- Environmental (e.g., solvent) effects on and direction of nanoscale structure formation
- In situ structural changes in nanoscale oxide catalysts used in automobile catalytic converters
- Structure of hydrogen storage materials under in situ conditions
- Transient structures of materials under extreme conditions (e.g., at high temperature or high pressure under the influence of transient fields or in metastable states)
|Moderator||decoupled poisoned supercritical hydrogen|
|Moderator-to-sample distance||19.5 m|
|Sample-to-detector distance||0.5 – 3 m|
|Wavelength range||0.1 – 3 Å|
|Momentum transfer range||0.04 – 100 Å-1|
|Detector angular range||3 – 175° scattering angle|
|Initial coverage||4.0 steradian|
|Full detector complement||8.2 steradian|
|Flux on sample||~1 × 108 neutrons cm-2 sec-1|
|Automated Sample Changer with Cobra Cryostream||90-500K, vanadium sample cans, quartz capillaries, NMR & kapton tubes|
|Orange Cryostat||2-310K, vanadium sample cans|
|ILL furnace||Room temperature -1200C, vanadium sample cans (Compatibility of sample with vanadium at high temperatures required)|
|Aerodynamic levitator||800-3000K, container-less solid samples|
|High Voltage Stick||+-10kV at room temperature, no temperature control, ceramic solids|
|Gas Handling Panel||2-310K in Cryostat + gas handling, vanadium sample cans|
More information can be found in this NOMAD overview presentation or "The Nanoscale Ordered Materials Diffractometer NOMAD at the Spallation Neutron Source SNS," published in Nucl. Inst. and Meth. B.