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首页> 外文期刊>Physical review. B, Condensed Matter And Materials Physics >Subfemtosecond dynamics of structural protons in silica xerogels
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Subfemtosecond dynamics of structural protons in silica xerogels

机译：二氧化硅干凝胶中结构质子的亚飞秒动力学

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Deep inelastic neutron scattering measurements on silica xerogels with different geometries (24 and 82 A pore size diameter) were performed on the VESUVIO spectrometer at the ISIS spallation neutron source, in order to investigate the modification of the ultrashort-time (10~(-15)-10~(-17) s) dynamics of the protons belonging to the silanol groups, when precursors are such as to modify the structural morphology. This paper is also intended to present a complementary experimental technique for the characterization of the microscopic dynamical properties of these materials. The mean kinetic energy < E_k > and the momentum distribution n(p) of the protons of the structural silanol groups in the two different systems are derived and compared at the same thermodynamic conditions. The results show that < E_k > is different for the two systems, reflecting the differences in the pore morphology. Indeed, < E_k > is higher for the system with an average pore diameter of 24 A, as compared to that of 82 A.
机译：在ISIS散裂中子源上的VESUVIO光谱仪上，对不同几何形状（孔径分别为24和82 A的二氧化硅干凝胶）进行了深度非弹性中子散射深度测量，以研究超短时间（10〜（-15） ）-10〜（-17）s）当前体改变结构形态时，属于硅烷醇基的质子的动力学。本文还旨在提供一种补充实验技术，用于表征这些材料的微观动力学特性。在相同的热力学条件下，推导并比较了两个不同系统中结构硅烷醇基的质子的平均动能和动量分布n（p）。结果表明，两个体系的不同，反映出孔形态的差异。实际上，平均孔径为24 A的系统的高于82 A的系统。

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