Update of the present X-band EPR spectrometer and upgrade with a Q-band facility and closed cycle cryostat for measurements at liquid helium temperatures

电子顺磁共振（EPR）光谱是表征含铁硫金属蛋白、顺磁性无机复合物和有机自由基体系的性质、结构、功能和机制时的首选方法。在这份主要研究仪器拨款申请中，来自化学，物理和机械与工艺工程系的七个凯泽斯滕技术大学（TUK）的小组描述了他们当前和未来的研究。对于这七个小组以及其他当地用户和我们的外部合作者来说，更新已有20年历史的X波段EPR光谱仪至关重要。由于其年龄，该仪器经常发生故障，更换部件的可用性变得非常成问题。此外，升级Q波段设施将能够解释自旋耦合生物系统和（高自旋）无机复合物的高度复杂的光谱。此外，更新的封闭循环低温恒温器将确保随时获得液氦温度下的测量结果。特别是在液氦供应瓶颈日益频繁的时候，较低的氦消耗和液氦输送的独立性将是非常有利的。更新将保证我们基于EPR的研究活动的继续，Q波段和闭合循环低温恒温器的升级将开辟新的研究前景。我们预计，所要求的收购将对TUK在SFB/TRR 173 SPIN+X，SFB/TRR 88 3 MET和SPP 1927内的合作以及未来的研究计划中的研究特别有价值。

Electron Paramagnetic Resonance (EPR) spectroscopy is the method of choice when characterizing properties, structures, functions, and mechanisms of iron-sulfur-containing metalloproteins, paramagnetic inorganic complexes, and organic radical systems. In this Major Research Instrumentation grant application seven groups of the Technical University of Kaiserslautern (TUK) from the Departments of Chemistry, Physics and Mechanical & Process Engineering describe their current and future research. It is crucial for these seven groups, as well as for other local users and our external collaborators, to update the twenty year-old X-band EPR spectrometer. Due to its age, the instrument is subject to frequent failures and the availability of replacement parts is becoming very problematic. Furthermore, an upgrade with a Q-band facility would enable the interpretation of highly complicated spectra of spin-coupled biological systems and (high spin) inorganic complexes. In addition, an update with a closed cycle cryostat will ensure access to measurements at liquid Helium temperatures at any time. Especially in times of increasingly frequent bottlenecks in the liquid helium supply, the lower Helium consumption and the independence of liquid Helium delivery would be highly advantageous. The update will guarantee the continuation of our EPR-based research activities and the Q-band and closed cycle cryostat upgrades would open up new research perspectives. We envisage that the requested acquisition will be particularly valuable for research at the TUK within the SFB/TRR173 SPIN+X, the SFB/TRR88 3MET and the collaborations within SPP1927, as well as in future research programs.