300 MHz NMR Spectrometer

弗赖堡阿尔伯特路德维希大学的MagRes网络需要在“物理化学研究所”（IPC）站点配备一台带有“标准孔”磁体（SB）的300 MHz NMR光谱仪。申请的300 MHz NMR光谱仪与600 MHz NMR光谱仪一起构成了IPC MagRes站点的主要研究NMR仪器。大多数液体核磁共振实验在那里进行，固态核磁共振实验的比例要小得多。主要的重点是广泛的调查光诱导顺磁性中间体使用的光CIDNP方法（CIDNP：（光）化学诱导的动态核极化）使用一个特殊的原位照明装置。通过同时提供用于样品激发的脉冲和连续波激光器（cw激光器），MagRes网络中IPC的NMR设备为弗赖堡大学的所有感兴趣的用户提供了进行原位光诱导NMR实验的独特可能性，例如通过NMR光谱研究光反应动力学或启动由光引发的化学反应。申请的300兆赫核磁共振仪是用来取代自1987年以来一直在使用的现有300兆赫核磁共振分光计; 1997年更换了一个控制台。旧仪器极易出现故障，不再允许受控测量操作。制造商不再保证备件的可用性。近年来，可以花费大量时间和金钱从其他核磁共振场地获得使用过的备件;然而，修理总是只能短期解决问题。此外，自1987年以来一直在运行的磁体的氦和氮的高蒸发率由于液氦的价格不断上涨而导致非常高的维护成本。因此，一个完整的光谱仪申请。

The MagRes network of the Albert Ludwig University Freiburg requires a 300 MHz NMR spectrometer with a "standard bore" magnet (SB) at the "Institute of Physical Chemistry" (IPC) site. The 300 MHz NMR spectrometer applied for, together with a 600 MHz NMR spectrometer, forms the main research NMR instrumentation at the MagRes site at the IPC. Mostly liquid NMR experiments are carried out there, with a much smaller proportion of solid-state NMR experiments. The main focus is on extensive investigations of light-induced paramagnetic intermediates using the photo-CIDNP method (CIDNP: (photo-)chemically induced dynamic nuclear polarisation) using a special in-situ illumination apparatus. With the simultaneous availability of pulse and continuous-wave lasers (cw lasers) for sample excitation, the NMR devices at the IPC within the MagRes network offer all interested users of the Albert-Ludwigs-University of Freiburg the unique possibility to perform in-situ light-induced NMR experiments, e.g. to investigate the kinetics of photoreactions NMR spectroscopically or to start chemical reactions triggered by light. The 300 MHz NMR instrument applied for is a replacement for an existing 300 MHz NMR spectrometer that has been in operation since 1987; a console was replaced in 1997. The old instrument is extremely susceptible to faults and no longer permits controlled measurement operation. The availability of spare parts can no longer be guaranteed by the manufacturer. In recent years, it has been possible to obtain used spare parts from other NMR sites at considerable cost in terms of time and money; however, repairs have always resulted in only a short-term solution to the problems. In addition, the high evaporation rates for helium and nitrogen of the magnet, which has been in operation since 1987, lead to very high maintenance costs due to the constantly rising price of liquid helium. Therefore, a complete spectrometer is applied for.