The modular Flexline resonators are a unique solution for the demands in CW- and FT-EPR. They are the backbone of all pulse-EPR applications with the multi-frequency & multi-resonance ELEXSYS platform. A common feature of the Flexline probes is their high filling factor with correspondingly high sensitivity.
All Flexline resonators share the same cryogenics systems.
The ER 4118X-MD5 is the universal probe of the ELEXSYS E 580 CW/FT-EPR X-Band spectrometer. It accepts sample tubes up to 5 mm O.D. and generates π/2-pulses of 10 ns at a bandwidth of 500 MHz. Due to its high filling factor it provides a high sensitivity even at the large bandwidth (low Q) required for FT-EPR spectroscopy.
Quick and easy sample changing is a standard feature at all temperatures even in high power operation. Ease of use is thereby greatly enhanced.
The resonator Q-factor can be changed continuously from very high to very low by varying the degree of coupling. This feature allows to match the resonator bandwidth to the specific experimental task, i.e. the lowest Q for the shortest dead-time and largest bandwidth, or a Q matched to the spin relaxation time for maximum signal-to-noise or critically coupled for CW-EPR.
The versatility is further enhanced by the (optional) optical window which allows irradiation of the total active resonator volume. The optical transparency is better than 90% in the range from 200 nm to 5 µm.
This resonator is an integral part of the E 560D-P DICE pulsed ENDOR accessory. It provides a constant nuclear spin flip angle over a very large frequency range, greatly simplifying optimisation of the ENDOR signal and facilitating automated multiple dimension experiments. The EPR performance is as superior as with the ER 4118X-MD5 dielectric ring resonator. more...