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

John Franck, Ryan P. Barnes, Timothy J. Keller, Thomas Kaufmann, Songi Han

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Pages (from-to)199-204
Number of pages6
JournalJournal of Magnetic Resonance
Volume261
DOIs
StatePublished - Dec 1 2015
Externally publishedYes

Fingerprint

Electron Spin Resonance Spectroscopy
cancellation
Paramagnetic resonance
electron paramagnetic resonance
pulses
Resonators
resonators
Microwaves
availability
rings
Availability
waveforms
Pulse generators
Cavity resonators
microwaves
Experiments
Biological systems
Hinges
pulse generators
hinges

Keywords

  • Active cancellation
  • Arbitrary Waveform Generation
  • AWG EPR
  • Dead-time limited EPR
  • FPGA EPR
  • Pulse EPR

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Biochemistry
  • Biophysics
  • Condensed Matter Physics

Cite this

Active cancellation - A means to zero dead-time pulse EPR. / Franck, John; Barnes, Ryan P.; Keller, Timothy J.; Kaufmann, Thomas; Han, Songi.

In: Journal of Magnetic Resonance, Vol. 261, 01.12.2015, p. 199-204.

Research output: Contribution to journalArticle

Franck, John ; Barnes, Ryan P. ; Keller, Timothy J. ; Kaufmann, Thomas ; Han, Songi. / Active cancellation - A means to zero dead-time pulse EPR. In: Journal of Magnetic Resonance. 2015 ; Vol. 261. pp. 199-204.
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