Electron spin resonance and nuclear magnetic resonance spectroscopy of organic semiconductors

拟议项目的目的是发展对固态有机半导体中电子和核自旋弛豫机制的基本理解，以及开发表征这些材料中电子和核自旋之间耦合的方法。电子自旋弛豫的机制目前还没有得到很好的理解，特别是超精细和自旋-轨道相互作用诱导的弛豫机制的相对重要性，以及相关动态过程的性质，这些过程产生的时变磁场可以诱导自旋翻转。像奥弗豪泽效应或DNP这样的现象在这些材料中仍然很大程度上未被探索。在该项目中，您将开发一种DNP方法，用于表征薄膜样品中的有机半导体及其构象和局部微观结构，并探索基于控制电子-核自旋相互作用的这些材料中的新物理现象，这些材料可能用于能量存储，自旋电子学或量子信息处理等应用。该项目主要是一个实验项目，基于结合电子自旋共振（ESR）和核磁共振（NMR）光谱测量在卡文迪什实验室和化学系以及动态核极化（DNP）测量;该项目还将涉及实验光谱的建模。

The aim of the proposed project is to develop a fundamental understanding of the mechanisms for electron and nuclear spin relaxation in organic semiconductors in the solid state as well as to develop methods for characterising the coupling between electron and nuclear spins in these materials. Mechanisms for electron spin relaxation are currently not well understood, in particular the relative importance of hyperfine and spin-orbit interaction induced relaxation mechanisms as well as the nature of the relevant dynamic processes which generate the time-varying magnetic fields that can induce spin-flips. Phenomena like the Overhauser effect or DNP remain largely unexplored in these materials. In the project you will develop a DNP method for characterizing organic semiconductors and their conformation and local microstructure in thin films samples, as well as explore novel physical phenomena in these materials based on controlling electron - nuclear spin interactions that could potentially be exploited in applications such as energy storage, spintronics or quantum information processing. The project is mainly an experimental project based on combining electron spin resonance (ESR) and nuclear magnetic resonance (NMR) spectroscopy measurements available in the Cavendish Laboratory and the Department of Chemistry as well as dynamic nuclear polarisation (DNP) measurements; the project will also involve modeling of the experimental spectra.