ELEXSYS-II E600/680

The ELEXSYS family of EPR spectrometers now includes two W-band systems, the E600 and E680. The former is optimized for CW-EPR experiments at 94 GHz, while the E680 operates in both CW- and FT-mode. These high-class research instruments provide a maximum in performance and flexibility while still being easy to operate. Thus all of the advantages of high frequency EPR become readily accessible.

This setup provides an accurate final operating frequency - a must for all g-factor measurements. Flexibility in the system is assured by the modular architecture, allowing the system to be setup as a CW or a combined FT/CW instrument. System operation can be switched from CW to FT or even from W-Band to X-Band at the push of a button. The variable-temperature W-band TeraFlex probehead operates from 4 K to 300 K.
 
Samples can be exchanged at any temperature. High precision cavity matching, tuning and sample positioning mechanics facilitate high sample throughput with easy handling. For bridge and resonator tuning a 400-MHz wide tuning display is generated and detected on the IF. All these hardware features are complemented by the Xepr software with its easy-to-learn graphical user interface.

• The high magent field required for W-band operation requires a superconducting magnet, however not all superconducting magnets are sutiable for EPR. Thus the EPR 6T SC was developed with EPR spectroscopy in mind.
  
• As high frequency EPR, in particular pulse EPR, has evolved so have the desires of the EPR spectroscopist. Depending on the pulse EPR experiment, certain advantages are available with more microwave power. For such situations, we offer two W-band bridge upgrades.

•94 GHz operation frequency

•CW and FT operation

•ELDOR and ENDOR

•100 mW, 400 mW and 2 W power options

•Single mode resonator

•Sample temperature: 4-300 K

•Superconducting magnet

• 6 T main coil
• 0.2 T sweep coil

For pulse EPR measurements, where short pulses and large excitation bandwidths are desired (ESEEM, DEER, and FT), three W-band bridge upgrades are available: the 2 W, 400 mW and 100 mW High Power Upgrade.  The 400 mW High Power Upgrade with the standard W-band resonator achieves pulse lengths (90^o) of 16 ns.  While the 100 mW High Power Upgrade routinely achieves pulse lengths (90^o) of 40 ns.
The benefits of the 400 mW High Power Upgrade are easily observed in the 4-pulse DEER Experiment.  The shorter pulse lengths lead to a higher signal to noise in the DEER spectrum which translates to a decrease in measuring time when compared to the longer pulses needed with the 100 mW High Power Upgrade.