Synchrotron X-ray Spectroscopic Studies of Oxide Surfaces and Oxide-Water Interfaces

本研究的主要重点是详细调查 原子和电子结构的取向，单 晶体表面的几个地球化学和 环境重要的氧化物矿物（α-SiO2，α- Al 2 O3和α-Fe 2 O3）。 样本将在 并在与水和电解质溶液反应后， 表面敏感同步辐射方法，包括X- 射线驻波，表面扩展X射线吸收精细 结构和核心级的光发射技术。 的 这些研究成果最终将应用于 环境地球化学领域， 水和含水金属离子与矿物表面相互作用。 该项目的第二个重点是继续高 硅酸盐温度x射线吸收谱研究 液体. 收集的镍锗酸盐中Ni 2+和Ge的数据 液体和硅酸盐液体中的Ni将用于获得 这些地区当地环境的定量信息 作为温度的函数。

The major focus of this research is a detailed investigation of the atomic and electronic structures of oriented, single crystal surfaces of several geochemically and environmentally important oxide minerals (alpha-SiO2, alpha- Al2O3, and alpha-Fe2O3). The samples will be studied before and after reaction with water and electrolyte solutions by surface-sensitive synchrotron radiation methods including X- Ray Standing Waves, Surface Extended X-Ray Absorption Fine Structure, and core level photemission techniques. The results of these studies will ultimately find application in the environmental geochemistry field in understanding how water and aqueous metal ions interact with mineral surfaces. A second focus of this project is the continuation of a high temperature x-ray absorption spectroscopy study of silicate liquids. Data collected on Ni2+ and Ge in Ni-germanate liquids and on Ni in silicate liquids will be used to obtain quantitative information on the local environment of these cations as a function of temperature.