X-Ray Studies of Quasi Crystals, Absolute Determination of Structure Factors

这项探索性的研究计划将使用新的技术， 内部多重布拉格散射来解决相位问题 确定准晶体的结构因子（QC）。 的QC 属于Al-Cu-Fe系。 多重散射的对象 技术是将X射线反射强度的变化与 多重结构因素的相对相位 散射 该技术已用于有机晶体， 尚未应用于QC。 该项目的第二部分涉及 具有所选结构因子的绝对测量。 这是 这是完全确定原子能的不可缺少的一步。 地点 该项目将涉及确定 非弹性康普顿散射。 如果成功， 这样获得的信息将被用来区分 在QC的竞争模型之间。//

This exploratory research proposal will use the novel technique of internal multiple Bragg scattering to address the problem of phase determination of structure factors of a quasi-crystal (QC). The QC is from the Al-Cu-Fe system. The object of the multiple scattering technique is to relate changes in intensity of x-ray reflections to relative phases of the structure factors involved in the multiple scattering. The technique has been used for organic crystals but has not been applied to QCs. The second part of the project deals with absolute measurements of selected structure factors. This is an indispensable step towards a complete determination of atomic locations. The project will involve determination of the ratio of elastic scattering to inelastic Compton scattering. If successful, the information so obtained would then be used to distinguish between competing models of QCs.//