Papers by Keyword: Scattering Intensity

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Authors: Dieter Strauch, B. Dorner, A.A. Ivanov, M. Krisch, J. Serrano, Alexey Bosak, Wolfgang J. Choyke, B. Stojetz, Michael Malorny
Abstract: Preliminary results for the phonon dispersion curves of hexagonal 4H-SiC from experimental inelastic neutron (INS) and X-ray scattering (IXS) are reported and contrasted with those of cubic 3C-SiC and silicon. The experimental frequencies and scattering intensities are in excellent agreement with those from first-principles calculations using density-functional methods. The relative merits of the two experimental techniques and aspects of the density functional perturbation theory and the so-called frozen phonon method for the determination of the basic phonon properties are briefly outlined.
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Authors: Hong Xia Wang, Hong Hui Sun, Dai Zhi Liu, Zi Biao Song
Abstract: The light scattering characteristics of nanographite aggregates are analyzed in this paper. Three dimensional fractal structures of aggregates were simulated based on the diffusion-limited aggregation model (DLA). For the incident wave of different wavelength, the method of discrete dipole approximation (DDA) was used to compute the light scattering intensity of nanographite aggregates and the changes of polarization along with the scattering angles, and the light scattering characteristics of nanographite aggregates were compared with the equal volume spherical nanographite particles. The computing results show that the non-spherical complex shape of nanographite aggregates has great effect on the scattering characteristics in the visible and near-infrared, and the angle distribution of scattering intensity and polarization have many complex changes. The forward scattering intensity of nanographite aggregates is obviously stronger than the equal volume spherical nanographite particles.
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