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. Author manuscript; available in PMC: 2011 May 12.
Published in final edited form as: Chem Rev. 2010 May 12;110(5):3212–3236. doi: 10.1021/cr900396q

Figure 8.

Figure 8

Two frequently used resonator designs for EPR spectrometer. a: Surface bridged, loop-gap resonator (LGR). The LGR resonator structure is housed inside a metallic tubular shield. Legends: i, active surface area for sample; ii, filed modulation coils; iii, resonator shield; iv, RF input connector; v, coupling adjustment ring. The connector for field modulation coil is not visible from this view. The resonant frequency of this unloaded LGR was 1.25 GHz. b: Volume reentrant resonator (RER). The RER houses a cylindrical cavity of 24 mm diameter and 22 mm of effective length. Legends: i, sample cavity opening; ii, modulation coils; iii, connector of modulation coils; iv, RF input connector; v, coupling adjustment knob. The resonant frequency of this unloaded RER was 1.27 GHz