Abstract
A robust yet sensitive Q-band (35 GHz) cavity has been designed for routine variable temperature electron paramagnetic resonance and electron nuclear double-resonance measurements down to 2 K. The cavity withstands repeated temperature cycling as well as providing high microwave energy density and magnetic-field modulation at the sample. It consists of an aluminum or brass (plain, silver, or gold-plated) ribbon imbedded in a cylindrical epoxy or epoxy/quartz composite with a tunable piston at the bottom. The cavity has all the advantages of the traditional silver wire-wound cavity often used for Q-band measurements but is much more robust and easier to construct. The cavity suppresses degenerate resonant modes and minimizes wall eddy currents induced by field modulation. With standard Varian Q-band modulation coils, a 100 kHz modulation field of 27 G peak-to-peak is obtained at the sample. The cavityQL(≈2500) and weak pitch signal/noise (≈1000:1) with a Varian/E-110 microwave bridge are comparable to those obtained with either a traditional wire-wound cavity or a cavity constructed with a thin silver wall on an epoxy/quartz substrate. A set of parallel posts along the axis of the cavity (bidirection) form the ENDOR coil. The “ribbon-wound” design should be useful in EPR and ENDOR applications at frequencies higher than Q band as well.
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