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)谱是表征含铁硫金属蛋白、顺磁性无机络合物和有机自由基体系的性质、结构、功能和机理的首选方法。在本次重大研究仪器拨款申请中，来自凯泽斯劳滕工业大学(突克)化学系、物理系和机械与过程工程系的七个小组描述了他们的研究现状和未来。对于这七个小组，以及其他本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光谱仪是至关重要的。由于年代久远，该仪器经常出现故障，更换部件的可用性也变得非常成问题。此外，Q波段设备的升级将能够解释高度复杂的自旋耦合生物系统和(高自旋)无机络合物的光谱。此外，带有闭合循环低温恒温器的更新将确保随时获得液氦温度的测量。特别是在液氦供应瓶颈日益频繁的时期，较低的氦消耗量和液氦输送的独立性将是非常有利的。这一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打开新的研究视角。我们预计，所要求的收购对于突克在SFB/TRR173 SPIN+X、SFB/TRR88 3MET以及SPP1927内部的合作以及未来的研究计划的研究将特别有价值。

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.