用于Condensed Matter研究的多用途高频电子自旋共振谱仪
Multipurpose High Frequency Electron Spin Resonance Spectrometer for Condensed Matter Research
摘要：
我们描述了一个准光学多频ESR谱仪工作在75-225 GHz的范围内，并在210 GHz的优化，一般用于凝聚态物理，化学和生物学。准光桥检测ESR处毫米波偏振的变化。可控参考臂在检测器处保持毫米波偏置。在222.4 GHz和300 K的非共振探头中，在稀释的Mn：MgO样品上测量获得的2 × 10^10自旋/G/（Hz）1/2的灵敏度与商业高灵敏度X波段光谱仪相当。该光谱仪具有基于法布里-珀罗谐振器的探头以测量水溶液，以及探头以测量单晶的磁场角度依赖性。该光谱仪坚固耐用，易于使用，可由本科生操作。通过凝聚态物理各个领域的例子来说明它的性能。
英文摘要：
We describe a quasi-optical multifrequency ESR spectrometer operating in the 75-225 GHz range and optimized at 210 GHz for general use in condensed matter physics, chemistry and biology. The quasi-optical bridge detects the change of mm wave polarization at the ESR. A controllable reference arm maintains a mm wave bias at the detector. The attained sensitivity of 2x10^10 spin/G/(Hz)1/2, measured on a dilute Mn:MgO sample in a non-resonant probe head at 222.4 GHz and 300 K, is comparable to commercial high sensitive X band spectrometers. The spectrometer has a Fabry-Perot resonator based probe head to measure aqueous solutions, and a probe head to measure magnetic field angular dependence of single crystals. The spectrometer is robust and easy to use and may be operated by undergraduate students. Its performance is demonstrated by examples from various fields of condensed matter physics.
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