Maly Thorsten, Bryant Jeff, Ruben David, Griffin Robert G
Francis Bitter Magnet Laboratory and Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
J Magn Reson. 2006 Dec;183(2):303-7. doi: 10.1016/j.jmr.2006.09.012. Epub 2006 Oct 4.
We describe a field-lock/field-sweep system for the use in superconducting magnets. The system is based on a commercially available field mapping unit and a custom designed broad-band 1H NMR probe. The NMR signal of a small water sample is used in a feedback loop to set and control the magnetic field to high accuracy. The current instrumental configuration allows field sweeps of +/-0.4 T and a resolution of up to 10(-5) T (0.1 G) and the performance of the system is demonstrated in a high-field electron paramagnetic resonance (EPR) application. The system should also be of utility in other experiments requiring precise and reproducible sweeps of the magnetic field such as DNP, ENDOR or PELDOR.
我们描述了一种用于超导磁体的场锁定/场扫描系统。该系统基于一个商用的场测绘单元和一个定制设计的宽带¹H NMR探头。小水样的NMR信号用于反馈回路中，以高精度设置和控制磁场。当前的仪器配置允许进行±0.4 T的场扫描，分辨率高达10⁻⁵ T（0.1 G），并且该系统的性能在高场电子顺磁共振（EPR）应用中得到了证明。该系统在其他需要精确且可重复的磁场扫描的实验中也应具有实用性，例如动态核极化（DNP）、电子核双共振（ENDOR）或脉冲电子电子双共振（PELDOR）。
