300 MHz NMR Spectrometer

弗莱堡阿尔伯特·路德维希大学（Albert Ludwig University Freiburg）的磁谱仪网络需要在“物理化学研究所”（IPC）现场配备300 MHz核磁共振光谱仪和“标准孔”磁铁（SB）。申请的300 MHz核磁共振光谱仪与600 MHz核磁共振光谱仪一起构成了IPC MagRes站点的主要研究核磁共振仪器。这里主要进行液态核磁共振实验，固态核磁共振实验的比例要小得多。主要重点是利用特殊的原位照明设备，使用光-CIDNP方法（CIDNP:（光）化学诱导动态核极化）广泛研究光诱导顺磁中间体。由于同时可用脉冲和连续波激光器（cw激光器）进行样品激发，MagRes网络内IPC的核磁共振设备为所有感兴趣的用户提供了独特的可能性，可以进行原位光诱导核磁共振实验，例如研究光反应的动力学核磁共振光谱或启动由光触发的化学反应。申请的300 MHz核磁共振仪是对1987年开始运行的现有300 MHz核磁共振光谱仪的替换；1997年更换了游戏机。旧的仪器极易发生故障，不再允许控制测量操作。制造商不能再保证备件的供应。近年来，已经有可能从其他核磁共振站点获得使用过的备件，在时间和金钱方面花费相当大的成本；然而，维修总是只能在短期内解决问题。此外，自1987年开始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，导致维护成本非常高。因此，采用完整光谱仪。

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.