Key result
A Q-band (35 GHz) loop-gap resonator for electron-spin-resonance spectroscopy was developed, achieving high-energy densities (15 GW−1/2) and permitting observation of dispersion with minimal phase noise.
The development of a Q-band loop-gap resonator extends its utility in electron-spin-resonance spectroscopy, achieving high-energy densities and good theoretical-experimental agreement.
May enable Q-band ESR dispersion studies with low noise; extends X-band resonator benefits while leaving broader adoption open.
The upper frequency for loop-gap resonators intended for use in electron-spin-resonance spectroscopy has been extended to Q band (35 GHz). A practical structure is described containing sample support, frequency tuning, and variable coupling. A typical sample volume is 39 nL. High-energy densities (15 GW−1/2) were achieved. As found previously at X band, Q-band loop-gap resonators permit observation of the dispersion with minimal demodulation of phase noise originating in the klystron. Theoretical calculations of the resonant frequency, Q, and the filling factor are found to be in good agreement with experiment.
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Froncisz et al. (1986) studied this question. Q-band loop-gap resonator was evaluated. A Q-band (35 GHz) loop-gap resonator for electron-spin-resonance spectroscopy was developed, achieving high-energy densities (15 GW−1/2) and permitting observation of dispersion with minimal phase noise.
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