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Nonresonant Transmission Line Probe for Sensitive Interferometric Electron Spin Resonance Detection.

Pragya R Shrestha1,2, Nandita Abhyankar2,3, Mark A Anders2

  • 1Theiss Research , La Jolla , California 92037 , United States.

Analytical Chemistry
|August 6, 2019
PubMed
Summary

We developed a versatile nonresonant transmission line Electron Spin Resonance (ESR) probe. This probe enhances experimental accessibility for diverse samples without sacrificing detection sensitivity.

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Area of Science:

  • Physics
  • Chemistry
  • Materials Science

Background:

  • Electron Spin Resonance (ESR) spectroscopy is crucial for detecting paramagnetic species in various systems.
  • Improving ESR sensitivity often limits experimental accessibility to specific sample types.
  • There is a need for more versatile ESR detection methods.

Purpose of the Study:

  • To present a novel nonresonant transmission line ESR probe.
  • To enhance experimental accessibility for a wider range of sample geometries and compositions.
  • To maintain high detection sensitivity with improved usability.

Main Methods:

  • Utilized a microstrip geometry nonresonant transmission line ESR probe.
  • Implemented a universal sample holder for solid and liquid samples.
  • Employed a sensitive microwave interferometer-based detection circuit to compensate for low Q-factor.
  • Enabled transmission, reflection, or dual-mode detection.

Main Results:

  • The nonresonant probe effectively couples microwave fields to diverse sample types.
  • High frequency magnetic field homogeneity was significantly increased.
  • The system achieved sensitivity comparable to commercial high-Q resonator ESR spectrometers.
  • Dual-mode detection provided a √2 signal enhancement.

Conclusions:

  • The developed nonresonant transmission line ESR probe offers broad applicability.
  • It overcomes limitations of traditional ESR spectrometers regarding sample accessibility.
  • This innovation advances ESR spectroscopy for research and potential applications.