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A Homebuilt ESE Spectrometer on the Basis of a High-Power Q-Band Microwave Bridge

机译：基于高功率Q波段微波桥的家用ESE光谱仪

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摘要

We present a Q-band spectrometer which was built recently at the Institute of Physical Chemistry of the University of Stuttgart. It allows us to perform the field-sweep electron spin echo (ESE), pulsed electron-nuclear double resonance (ENDOR), relaxation and electron spin echo envelope modulation experiments both at room and low (down to 1.5 K) temperatures. The spectrometer consists of and electromagnet, digital field controller, pulsed microwave bridge with 10.8 W output power is based on a two-stage IMPATT-diode pulse amplifier. The commercial Varian electromagnet system is controlled by a 24-bit home-built digital controller. The external devices are interfaced to the two PCs via GPIB and LAN. The spectrometer control software was developed in Visual C++. It consists of two programs running synchronously on the control PCs. The spectrometer is equipped with a cylindrical TE011 cavity constructed both for ESE and for pulsed ENDOR. The cavity fits into a liquid He cryostat thus allowing low-temperature experiments. An 8-bit data acquisition digitizer is used to collect the echo signals, and the PBESR-PRO-400 digital word generator orchestrates the pulse experiments and sets pulse sequences of the microwave bridge. The spectrometer performance is demonstrated on nitrogen impurities in a polycrystalline synthetic diamond, on silver clusters supported on NaA zeolite and electron-irradiated tooth enamel.
机译：我们介绍了最近在斯图加特大学物理化学研究所建造的Q波段光谱仪。它使我们能够在室温和低温（低至1.5 K）下进行场扫描电子自旋回波（ESE），脉冲电子核双共振（ENDOR），弛豫和电子自旋回波包络调制实验。该光谱仪由电磁体，数字场控制器，输出功率为10.8 W的脉冲微波桥组成，该桥基于两级IMPATT二极管脉冲放大器。商用瓦里安电磁系统由24位家用数字控制器控制。外部设备通过GPIB和LAN连接到两台PC。光谱仪控制软件是用Visual C ++开发的。它由两个在控制PC上同步运行的程序组成。光谱仪配备有一个圆柱形的TE011腔，用于ESE和脉冲ENDOR。腔体适合于液态He低温恒温器，因此可以进行低温实验。 8位数据采集数字化仪用于收集回波信号，而PBESR-PRO-400数字字发生器可协调脉冲实验并设置微波桥的脉冲序列。在多晶合成金刚石中的氮杂质，NaA沸石和电子辐照的牙釉质上负载的银团簇上，证明了光谱仪的性能。

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