Inelastic neutron scattering due to acoustic vibrations confined in nanoparticles: theory and experiment

Details Inelastic neutron scattering due to acoustic vibrations confined in nanoparticles: theory and experiment Inelastic neutron scattering due to acoustic vibrations confined in nanoparticles: theory and experiment

2008-11-20

arxiv.org/abs/0811.3285v1

Phys. Rev. B 78, 245426 (2008)

Physics

Condensed Matter

Materials Science

3 figures, 1 table

Scientific paper

10.1103/PhysRevB.78.245426

The inelastic scattering of neutrons by nanoparticles due to acoustic vibrational modes (energy below 10 meV) confined in nanoparticles is calculated using the Zemach-Glauber formalism. Such vibrational modes are commonly observed by light scattering techniques (Brillouin or low-frequency Raman scattering). We also report high resolution inelastic neutron scattering measurements for anatase TiO2 nanoparticles in a loose powder. Factors enabling the observation of such vibrations are discussed. These include a narrow nanoparticle size distribution which minimizes inhomogeneous broadening of the spectrum and the presence of hydrogen atoms oscillating with the nanoparticle surfaces which enhances the number of scattered neutrons.

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