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College Park, Maryland      June 6 - 10 , 2004

TP18: Vibrational Spectroscopy with the NIST Filter-Analyzer Neutron Spectrometer (FANS)

J.B. Leao, T.J. Udovic (NIST Center for Neutron Research), C.M. Brown (NIST Center for Neutron Research; Department of Materials Science and Engineering, University of Maryland), D.A. Neumann (NIST Center for Neutron Research)

Neutron vibrational spectroscopy (NVS) is an invaluable technique for investigating solid-state vibrational dynamics. In particular, the typical range of energies accessible with reactor- and pulse-source-based neutrons spans the region of important lattice and molecular vibrations. Moreover, the unique nature of the neutron-nucleus interaction permits the observation of all vibrational modes in an NVS experiment, not just those that satisfy appropriate symmetry-based selection rules as in photon spectroscopies. NVS is particularly useful for characterizing hydrogenous materials since the incoherent scattering cross section for hydrogen is much larger than for virtually all the other elements. Over the past couple of years, neutron vibrational spectra have been collected for a broad array of both hydrogenous and nonhydrogenous systems utilizing the significantly improved Filter-Analyzer Neutron Spectrometer (FANS) at the NIST Center for Neutron Research. Here we exemplify the impact that FANS can have as a unique spectroscopic probe of materials within the fields of physics, chemistry, and biology.

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