High-Resolution Crystallographic Studies Using Synchrotron Radiation

Coppens教授得到了实验基金会的资助。 物理化学计划使用同步辐射， 确定固体中原子的位置， 超导体和作为导体的有机物质。 这些研究将帮助我们理解为什么有些材料 在高温下是超导体， 材料在非常低的温度下是超导体。 该项目涉及使用同步辐射来研究 以下：X射线的异常散射用于 选择性地确定场地占用情况，并结合 高精度电荷密度技术， 测定固体中原子的氧化态。 的 有机和无机晶体对外界环境的响应 电场测量和分析的条款， 压电效应以及分子和离子位移。 超低温单晶技术被用于 晶体中的电荷密度分析，以及 结构依赖性的研究 低维导电固体对温度的影响

Professor Coppens is supported by a grant from the Experimental Physical Chemistry Program to use synchrotron radiation to determine the locations of atoms in solids which are superconductors and organic substances which are conductors. These studies will help us understand why some materials behave as superconductors at high temperatures and why the organic materials are superconductors at very low temperatures. The project involves the use of synchrotron radiation to study the following: Anomalous scattering of X-rays is used to selectively identify site occupancy, and in combination with high-accuracy charge density techniques, to site-selectively determine the oxidation states of atoms in solids. The response of organic and inorganic crystals to an external electric field is measured and analysed in terms of the piezoelectric effect and molecular and ionic displacements. Very low temperature single crystal techniques are used in the analysis of charge densities in crystals, and in the investigation of the dependence of the structure of low-dimensional conducting solids on temperature.