Bauer C, Raich H, Jeschke G, Blümler P
Max Planck Institute for Polymer Research, Postfach 3148, 55021 Mainz, Germany.
J Magn Reson. 2009 Jun;198(2):222-7. doi: 10.1016/j.jmr.2009.02.010. Epub 2009 Feb 27.
A magnetic system is introduced which consists of three nested rings of permanent magnets of a Halbach dipolar layout and is capable for EPR spectroscopy. Two of the rings can be rotated independently to adjust the magnetic flux in the center and even allow for mechanical field sweeps. The presented prototype achieves a magnetic flux range of 0.0282-0.3013T with a minimal sweep of 0.15mT and homogeneity of about 10(-3). First applications with CW and pulsed Mims ENDOR as well as ESEEM experiments on a sample of a glycine single crystal doped with 1% copper nitrate demonstrate that flux range, sweep accuracy and homogeneity of this prototype is sufficient for EPR experiments on most solid samples. Together with a recently improved design magnets can be build which could serve as compact and easily transportable replacement of standard electromagnets with negligible consumption of power or coolants.
介绍了一种磁系统，它由三个呈哈尔巴赫偶极布局的嵌套永久磁环组成，可用于电子顺磁共振光谱学。其中两个磁环可以独立旋转，以调节中心的磁通量，甚至可以进行机械场扫描。所展示的原型实现了0.0282 - 0.3013T的磁通量范围，最小扫描为0.15mT，均匀性约为10(-3)。首次将连续波和脉冲Mims ENDOR以及电子自旋回波包络调制（ESEEM）实验应用于掺杂1%硝酸铜的甘氨酸单晶样品，结果表明该原型的磁通量范围、扫描精度和均匀性足以用于大多数固体样品的电子顺磁共振实验。结合最近改进的设计，可以制造出磁体，它们可以作为紧凑且易于运输的标准电磁铁替代品，功耗或冷却剂消耗可忽略不计。
