Department of Chemistry, West Virginia University, Morgantown, WV, 26506, USA.
Department of Chemistry, West Virginia University, Morgantown, WV, 26506, USA.
Solid State Nucl Magn Reson. 2018 Jul;91:9-14. doi: 10.1016/j.ssnmr.2018.01.002. Epub 2018 Feb 3.
Some MAS NMR experiments are sensitive to fluctuations or drifts in rf field strengths. We examine the simple H-C CPMAS experiment and show that the C signal intensities vary over time due to drifts in rf field strengths. The causes of the drifts in rf field strengths are studied. Stabilization of the rf field strengths are obtained by using an rf field-strength controller. The controller is a stand-alone unit, which can be easily incorporated in any spectrometer system. Details of the controller, including circuit design, are provided.
有些 MAS NMR 实验对射频场强的波动或漂移很敏感。我们检查了简单的 H-C CPMAS 实验，结果表明由于射频场强的漂移，C 信号强度随时间变化。研究了射频场强漂移的原因。通过使用射频场强控制器获得了射频场强的稳定。该控制器是一个独立的单元，可以很容易地集成到任何光谱仪系统中。提供了控制器的详细信息，包括电路设计。
