Compact, Integrated EPR Spectrometer for Dynamic Nuclear Polarization

描述（由申请人提供）：拟议的研究重点是开发用于DNP增强固态魔角旋转（MAS）NMR光谱的紧凑型集成高场EPR光谱仪。该光谱仪将允许研究人员记录EPR光谱，并在与DNP实验相同的条件下获得DNP样品的有价值的弛豫参数。近年来，DNP已被证明是一种在世界各地的实验室中增加NMR实验中信号强度的稳健方法，并且在将DNP用于固态NMR光谱学方面取得了实质性进展。然而，为了理解和优化DNP过程，充分理解极化剂的EPR谱和弛豫参数至关重要。全世界只有几台自制的高场光谱仪。因此，研究人员经常不得不推测他们的DNP样品的EPR特征。我们建议开发一种具有成本效益的EPR光谱仪，可以很容易地适应覆盖整个频率范围，目前使用的DNP光谱。该设计将是紧凑和交钥匙，使该设备也可以由非专家使用。在该项目的第一阶段，我们将进行完整的机械和电气设计，并制造一个原型EPR光谱仪工作在263 GHz（400 MHz 1H）。这项技术的成功开发将为研究人员提供目前无法获得的EPR特性，并将促进DNP-NMR光谱学新的优化极化剂的开发。这将对美国国立卫生研究院资助的许多项目产生重大影响。

DESCRIPTION (provided by applicant): The proposed research focuses on the development of a compact, integrated high-field EPR spectrometer for DNP-enhanced solid-state, magic-angle-spinning (MAS) NMR spectroscopy. The spectrometer will allow researchers to record the EPR spectra and obtain valuable relaxation parameters of the DNP sample under the same conditions under which the DNP experiment is performed. In recent years, DNP has proven to be a robust method to increase signal intensities in NMR experiments in laboratories around the world and substantial progress has been made in adapting DNP for solid-state NMR spectroscopy. However, to understand and optimize the DNP process it is crucial to fully understand the EPR spectrum and relaxation parameters of the polarizing agent. Only a few home-built high-field spectrometers are available around the world. Therefore researchers often have to speculate about the EPR characteristics of their DNP sample. We propose to develop a cost-effective EPR spectrometer that can easily be adapted to cover the complete frequency range that is currently used in DNP spectroscopy. The design will be compact and turn-key so that the device can also be used by non experts. During Phase I of this project we will perform the complete mechanical and electrical design and fabricate a prototype EPR spectrometer operating at 263 GHz (400 MHz 1H). The successful development of this technology will provide researchers access to currently inaccessible EPR characteristics and will proliferate the development of new, optimized polarizing agents for DNP-NMR spectroscopy. This will be of large interest to many projects funded by the U.S. National Institutes of Health.