Neutron Scattering

adsorbed alloy glass amorphous amorphous solids angle anharmonic approximation Bragg calculated coherent scattering component concentration condensate constant coordination number correlation function coverage crystal crystalline curve density deuterium diffusion distribution dynamics Egelstaff elastic energy excitations experimental experiments fast ion fast ion conductors fluid fluorite Fourier transform frequencies Grafoil graphite hydrogen hydrogen atoms incoherent inelastic scattering interaction ion conductors ionic isotope lattice layer Lett line shape liquid magnetic measurements metal method micelles modes molecular molecules monolayer nematic neutron diffraction neutron scattering niobium observed obtained one-phonon parameters particle peak phase phonon Phys potential region roton S. K. Sinha sample scattering cross section scattering function scattering length short-range shown in Fig shows smectic solid spectra spectrum structure factor studies substrate superfluid surface Svensson temperature theory thermal transition two-dimensional values vibrational wave vector width x-ray