Locating Atoms by Observing Crystallographic Phase

通过观察晶体相来定位原子

• 批准号: DP150104483
• 负责人: Prof Joanne Etheridge
• 金额: $ 34.05万
• 依托单位: Monash University
• 依托单位国家: 澳大利亚
• 项目类别: Discovery Projects
• 财政年份: 2015
• 资助国家: 澳大利亚
• 起止时间: 2015-04-30 至 2020-12-08
• 项目状态: 已结题
• 来源: https://dataportal.arc.gov.au/RGS/Web/Grants/DP150104483
• 关键词: Locating; Atoms; Observing; Crystallographic; Phase

Atomic structures are determined by measuring how they scatter radiation. However half of the necessary information, the crystallographic phase, cannot be measured from the scattered intensity. For a century the only option has been to deduce the phase via the statistical analysis of thousands of intensity measurements. This project aims to develop a method to determine atomic structures from the direct observation of phase. From a handful of observations and no formal measurements, atoms can be located with picometre precision. It is predicted that this method will be direct, rapid and unequivocal, sensitive to light atoms and applicable to nanostructures, which will represent a paradigm shift in crystallography.

原子结构是通过测量它们如何散射辐射来确定的。然而，一半的必要信息，即晶体相，无法从散射强度中测量出来。一个世纪以来，唯一的选择是通过对数千次强度测量的统计分析来推断相位。该项目旨在开发一种通过直接观察相位来确定原子结构的方法。通过少量的观察和没有正式的测量，可以以皮米的精度定位原子。预计该方法将直接、快速、明确、对轻原子敏感并适用于纳米结构，这将代表晶体学的范式转变。