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Related Concept Videos

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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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Related Experiment Video

Updated: Jun 16, 2025

Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels
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Microwave field mapping for EPR-on-a-chip experiments.

Silvio Künstner1, Joseph E McPeak1, Anh Chu2

  • 1Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109 Berlin, Germany.

Science Advances
|August 16, 2024
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Summary

Electron paramagnetic resonance-on-a-chip (EPRoC) devices enable unique sample environments. This study maps the B1 field distribution of a 12-coil VCO array EPRoC, determining its sensitive volume for quantitative measurements.

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Area of Science:

  • Physics
  • Chemistry
  • Materials Science

Background:

  • Electron paramagnetic resonance-on-a-chip (EPRoC) devices utilize voltage-controlled oscillators (VCOs) for EPR signal excitation and detection.
  • EPRoC technology offers access to novel sample environments, overcoming limitations of traditional resonator-based EPR.
  • Previous EPRoC applications have shown high-resolution spectra across various frequencies (7-360 GHz) and spin centers.

Purpose of the Study:

  • To enable quantitative measurements with EPRoC devices, this study aimed to determine the spatial distribution of the B1 field generated by VCOs.
  • Characterize the B1 field distribution of a 12-coil VCO array EPRoC operating at 14 GHz.
  • Determine the sensitive volume of the EPRoC array for precise EPR analysis.

Main Methods:

  • Investigated frequency modulation-recorded EPR spectra of point-like and thin-film samples.
  • Varied sample positions in three dimensions relative to the EPRoC device.
  • Compared experimental EPR spectra with COMSOL simulations of B1-field intensity.

Main Results:

  • The spatial distribution of the B1 field from a 12-coil VCO array EPRoC was mapped.
  • Experimental data correlated well with COMSOL simulations of B1-field intensity.
  • The sensitive volume of the EPRoC array was quantified at approximately 19 nanoliters.

Conclusions:

  • Accurate knowledge of B1 field distribution is crucial for quantitative EPRoC measurements.
  • The characterized EPRoC device demonstrates potential for precise analytical applications.
  • Further implications for diverse EPR applications are discussed based on these findings.