The Vibrational Spectrometer at SNS
VISION is best thought of as the neutron analogue of an infrared-Raman spectrometer. It is optimized to characterize molecular vibrations in a wide range of crystalline and disordered materials over a broad energy range (<5 to >500 meV), while simultaneously recording structural changes using diffraction detectors in the backscattering position and at 90°. This inverted-geometry instrument offers enhanced performance by coupling a white beam of incident neutrons with two banks of eight analyzer modules, equipped with double-focusing crystal arrays, that focus the desired neutrons on a small detector.
This arrangement leads to improved signal noise, and the overall count rate in the inelastic signal is at least two orders of magnitude beyond that of similar spectrometers that are currently available.
VISION can be used for leading-edge studies in disciplines such as nanotechnology, catalysis, biochemistry, geochemistry, and condensed/soft-matter science.