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Instrument 2

For more information, contact Instrument Scientist: Eugene Mamontov,, 865.574.5109 Instrument Scientist: Souleymane Omar Diallo,, 865.574.7840 Scientific Associate: Stephanie Hammons,, 865.300.8100 BASIS is designed to provide extremely high-energy resolution near the elastic peak, enabling studies of the diffusive dynamics of molecules on the atomic length scale (quasi-elastic neutron scattering). This instrument features very high flux and a dynamic range in energy transfer that is approximately five times greater than what is available on comparable instruments today. In addition, this instrument provides the capability of shifting the incident neutron bandwidth, enabling inelastic scattering with meV energy transfer, with a resolution of several micro-eV.

Applications BASIS can be used to probe dynamic processes in various systems on the pico- to nanosecond time scale. It is well suited for probing diffusive and relaxational motions but can also be effectively used for studying some types of collective excitations in condensed matter. Applicable fields of study include, but are not limited to, biology, polymers, small molecules, complex fluids, magnetism, and materials science.

05-03083D/gim Measurement of the quantum tunneling peaks in 4-methyl pyridine N-oxide (N-oxy gamma-picoline, C 6 H 7 NO) at 4 K.

Backscattering spectrometer large evacuated final flight path.

Si 111 Elastic energy 2.08 meV Bandwidth 250 eV Resolution (elastic) 3.5 eV Q range (elastic) 0.2 -1 < Q < 2.0 -1 Solid angle 1.2 sr 2.4 sr (upgrade) Specifications Si 311 (upgrade) Elastic energy 7.64 meV Bandwidth 1700 eV Resolution (elastic) 10 eV Q range (elastic) 0.38 -1 < Q < 3.8 -1 Solid angle 1.2 sr May 2010 Status: Operational

Research Accelerator
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