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The Bruker High-Frequency-EPR System

机译：布鲁克高频EPR系统

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摘要

The design and performance of the first commercial 94 GHz continuous-wave (CW-)/Fou-rier transform (FT-) EPR and ENDOR spectrometer are described. The spectrometer design is based on a heterodyne microwave bridge using an X-band intermediate frequency (IF), a hybrid magnet system, a variable-temperature, top-loading TeraFlex probehead with a TE_011 cavity as well as the ELEXSYS-line digital electronics nad the Xepr software package. The W-band bridge can be driven by a CW-or pulse-IF unit and delivers a microwave power of 5mW at 94 GHz. In pulse mode the power is sufficient for a #pi#/2 pulse of 100 ns at a resonator Q-value of 3000. The magnet system consists of a 6 T split-coil superconducting magnet and a water-cooled room-temperature The main coil can be swept over the full range from 0 to 6 T. The room-temperature coil has a 800 G sweep range around the persistent field of the main magnet. The ENDOR probe features a tuned circuit for H nuclei allowing an RF #pi#-pulse of 8 #sigma#s with a 200 W amplifier. A broad -band setup is used for other nuclei. The E680 FT-EPR system utilizes the PatternJet pulse programmer and the SpecJet high-speed transient signal averager. The concerted action of these two devices results in a pulse EPR sensitivity equal or higher than in CW-EPR. Selected examples indicating the performance of the 94 GHz CW/FT-EPR and ENDOR systems are shown.
机译：描述了第一个商用94 GHz连续波（CW-）/傅里叶变换（FT-）EPR和ENDOR光谱仪的设计和性能。光谱仪的设计基于使用X波段中频（IF）的外差微波电桥，混合磁体系统，带有TE_011腔体的可变温度，顶部负载TeraFlex探头以及ELEXSYS-line数字电子产品Xepr软件包。 W波段电桥可由CW或脉冲IF单元驱动，并在94 GHz频率下提供5mW的微波功率。在脉冲模式下，在谐振器Q值为3000时，功率足以产生100 ns的＃pi＃/ 2脉冲。磁体系统由6 T分线圈超导磁体和水冷室温组成。线圈可以在0至6 T的整个范围内进行扫描。室温线圈在主磁体的持久磁场周围具有800 G的扫描范围。 ENDOR探头具有针对H核的调谐电路，可通过200 W放大器实现8＃sigma＃s的RF＃pi＃-脉冲。宽带设置用于其他原子核。 E680 FT-EPR系统使用PatternJet脉冲编程器和SpecJet高速瞬态信号平均器。这两个设备的协同作用导致脉冲EPR灵敏度等于或高于CW-EPR。显示了一些表明94 GHz CW / FT-EPR和ENDOR系统性能的示例。

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