The measurement of self-diffusion coefficients in liquid germanium using quasielastic neutron scattering

被引：0

作者：

Weis, Henning ^{[1
]}

Unruh, Tobias ^{[2
]}

Meyer, Andreas ^{[1
]}

机构：

[1] Deutsch Zentrum Luft & Raumfahrt DLR, Inst Mat Phys Weltraum, D-51170 Cologne, Germany

[2] Tech Univ Munich, Forsch Neutron Heinz Maier Leibnitz FRM II, D-85747 Garching, Germany

来源：

HIGH TEMPERATURES-HIGH PRESSURES | 2013年 / 42卷 / 01期

关键词：

Liquid germanium; atomic self diffusion; thermal diffusion; phonon dispersion; neutron scattering; X-ray scattering; coherent and incoherent scattering; Rayleigh line; Brillouin lines;

D O I：

暂无

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

We measured dynamic structure factors using quasielastic neutron scattering for two liquid germanium samples, one in natural isotope abundance, and a second one with a Ge-nat/73 isotope mixture which exhibits an order of magnitude larger ratio of incoherent to coherent neutron scattering cross section. In an intermediate q range corresponding spectra exhibit similar quasielastic broadening. We show that the measured quasielastic line originates from incoherent scattering. Coherent contributions appear as an almost energy independent background. From the incoherent quasielastic neutron scattering signal self-diffusion coefficients can therefore accurately be derived.

引用

页码：39 / 47

页数：9

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