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TOOLS & INSTRUMENTS

# High Flux Backscattering Spectrometer (HFBS)

 The NCNR backscattering spectrometer is one of the highest intensity instruments of its kind. It enables very high energy resolution studies of the low frequency dynamics of many systems. Applications of backscattering spectroscopy are numerous and include molecular reorientations, dynamics of adsorbed systems, and viscous liquids. To learn about the instrument, and about experiments that have been performed on the HFBS, please use this link to visit our webpages.

## Specifications/Capabilities

At the center of the beam, the neutron fluence rate is 3 x 105 n cm-2 s-1 as determined by gold foil activation measurements. A high-speed Doppler-driven monochromator system allows energy transfers up to **±50 μeV** (though this energy range is not advisable). The instrumental energy resolution is a Gaussian-like lineshape, with a full-width-half-maximum (FWHM) about **1 μeV**.

PolymersNeutron research

## Organizations

                          - NIST Headquarters
                            - Laboratory Programs
                              - NIST Center for Neutron Research
                                - NIST Center for Neutron Research

## Details

## Contact

                    -  Madhusudan Tyagi  madhusudan.tyagi@nist.gov      (301) 975-2046   

### HEADQUARTERS

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