Spectroscopy and Spectro-ptychography of Ordered and Disordered Materials

我的研究小组研究分子的X射线吸收光谱学中的基本问题，并利用这些见解通过X射线光谱显微镜和光谱关联学研究纳米材料。X射线吸收光谱是一种强大的技术，可提供样品中特定元素的详细化学信息。我们将研究分子的X射线吸收光谱中的温度依赖性，这可以提供这些光谱如何受到原子运动影响的信息。当我们探索X射线吸收光谱如何对有序和无序敏感时，我们可以使用这种方法来研究具有不寻常稳定性的分子玻璃。这项光谱学工作将提高我们通过X射线光谱显微镜对材料进行化学微量分析的能力。 重叠关联成像是一种快速发展的无透镜成像技术，具有显着提高X射线显微镜的空间分辨率的潜力，可达1-2 nm尺度。我的研究小组将通过在加拿大光源的研究和技术开发，将其在X射线显微镜方面的工作扩展到这种新形式的显微镜。我们将研究可以从这种方法中获得的新信息，并使用X射线光谱学来研究氧化铁纳米颗粒的组成和磁性结构，以帮助优化其在医学中的应用。

My research group studies basic questions in the X--ray absorption spectroscopy of molecules and uses these insights to study nanomaterials through X--ray spectromicroscopy and spectroptychograpy. X-ray absorption spectroscopy is a powerful technique that provides detailed chemical information on specific elements in a sample. We will examine the temperature dependence in the X-ray absorption spectra of molecules, which can provide information on how these spectra are affected by the motion of atoms. As we explore how X-ray absorption spectroscopy is sensitive to order and disorder, we can use this method to study molecular glasses that have unusual stability. This spectroscopy work will improve our ability to perform chemical microanalysis of materials by X-ray spectromicroscopy. Ptychography is a rapidly developing lensless imaging technique, with the potential to significantly improve the spatial resolution of X-ray microscopy, down to 1-2 nm scale. My research group will extend its work on X-ray microscopy to this new form of microcopy, through research and technique development at the Canadian Light Source. We will examine new information that can be obtained from this method, and use X-ray spectroptychography to study the composition and magnetic structure of iron oxide nanoparticles, to help optimize their use in medicine.