用中子散射探测玻璃形成甘油和LiCl-glycerol混合物中的过量翼
Excess wing in glass-forming glycerol and LiCl-glycerol mixtures detected by neutron scattering
摘要：
用不同的中子散射技术研究了玻璃形成甘油和甘油与LiCl混合物的弛豫动力学。所进行的中子自旋回波实验，延伸到相对较长的弛豫时间尺度的顺序为10纳秒，应该允许检测的贡献，从所谓的多余的翅膀。这种现象，其微观起源是有争议的讨论，出现在各种玻璃成型，直到现在，几乎完全是由介电光谱和光散射研究。在这里，我们表明，松弛过程中造成的多余翼也可以检测到的中子散射，直接耦合到密度起伏。
英文摘要：
The relaxational dynamics in glass-forming glycerol and glycerol mixed with LiCl is in-vestigated using different neutron scattering techniques. The performed neutron spin-echo experiments, which extend up to relatively long relaxation-time scales of the order of 10 ns, should allow for the detection of contributions from the so-called excess wing. This phenomenon, whose microscopic origin is controversially discussed, arises in a variety of glass formers and, until now, was almost exclusively investigated by dielectric spectros-copy and light scattering. Here we show that the relaxational process causing the excess wing also can be detected by neutron scattering, which directly couples to density fluctua-tions.
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