Note: High sensitivity pulsed electron spin resonance spectroscopy with induction detection

Twig, Ygal; Dikarov, Ekaterina; Hutchison, W. D.; Blank, Aharon

doi:10.1063/1.3611003

Cited by 31 publications

(29 citation statements)

References 17 publications

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“…At the current stage of hardware development, the active cancellation technique is successful with a solid-state amplifier at relatively low power (10-20 W) compared to a TWTA that offers high powers in the 1 kW range as employed for traditional pulse EPR applications. However, with recent advances in resonator design, in particular micro coil resonators with very high conversion factors, it is feasible to carry out many conventional pulse EPR experiments with high fidelity even with low microwave power (W to mW) [23,36–39]. One could thus imagine employing the AC method in conjunction with a micro coil setup in practical pulse EPR settings.…”

Section: Discussionmentioning

confidence: 99%

Active cancellation – A means to zero dead-time pulse EPR

Franck

Barnes

Keller

et al. 2015

Journal of Magnetic Resonance

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The necessary resonator employed in pulse electron paramagnetic resonance (EPR) rings after the excitation pulse and creates a finite detector dead-time that ultimately prevents the detection of signal from fast relaxing spin systems, hindering the application of pulse EPR to room temperature measurements of interesting chemical or biological systems. We employ a recently available high bandwidth arbitrary waveform generator (AWG) to produce a cancellation pulse that precisely destructively interferes with the resonant cavity ring-down. We find that we can faithfully detect EPR signal at all times immediately after, as well as during, the excitation pulse. This is a proof of concept study showcasing the capability of AWG pulses to precisely cancel out the resonator ring-down, and allow for the detection of EPR signal during the pulse itself, as well as the dead-time of the resonator. However, the applicability of this approach to conventional EPR experiments is not immediate, as it hinges on either (1) the availability of low-noise microwave sources and amplifiers to produce the necessary power for pulse EPR experiment or (2) the availability of very high conversion factor micro coil resonators that allow for pulse EPR experiments at modest microwave power.

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Section: Discussionmentioning

confidence: 99%

Active cancellation – A means to zero dead-time pulse EPR

Franck

Barnes

Keller

et al. 2015

Journal of Magnetic Resonance

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“…The observation can be explained by the magnetoresistance of copper at higher fields [35]. Planar structures (microstrip, stripline and coplanar) have already been employed for ESR experiments [15,[36][37][38][39][40][41][42][43][44][45][46]. Although microstrip and stripline resonators have also been successfully applied in ESR measurements [36-38, 41, 45, 47], coplanar configurations might be more appropriate candidates since they carry the signal non-dispersively in contrast to a microstrip configuration [45,48].…”

Section: Resultsmentioning

confidence: 99%

Metallic coplanar resonators optimized for low-temperature measurements

Rahim¹,

Lehleiter²,

Bothner³

et al. 2016

J. Phys. D: Appl. Phys.

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Metallic coplanar microwave resonators are widely employed at room temperature, but their low-temperature performance has received little attention so far. We characterize compact copper coplanar resonators with multiple modes from 2.5 to 20 GHz at temperatures as low as 5 K. We investigate the influence of center conductor width (20 to 100 µm) and coupling gap size (10 to 50 µm), and we observe a strong increase of quality factor (Q) for wider center conductors, reaching values up to 470. The magnetic-field dependence of the resonators is weak, with a maximum change in Q of 3.5% for an applied field of 7 T. This makes these metallic resonators well suitable for magnetic resonance studies, as we document with electron spin resonance (ESR) measurements at multiple resonance frequencies.

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“…47. Twig et al [256,257] report on the enhanced sensitivity for EPR measurements using a surface loop-gap microresonator, which reduces the effective volume of the resonator, though has a low Q factor of around 15. The system operates in the frequency range 6-18 GHz at room temperature and has the capability for measurements down to 5 K. Furthermore, it offers a sensitivity of 1 Â 10 6 spins/ ffiffiffiffiffiffi ffi Hz p , corresponding to around $ 2.5 Â 10 4 spins for a 1-h measurement.…”

Section: Ferromagnetic Resonancementioning

confidence: 98%