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Macroscopic sample shape effect on pulse electron double resonance (PELDOR) signal.

Vasyl Denysenkov1, Thomas F Prisner1, Petr Neugebauer2

  • 1Institute of Physical and Theoretical Chemistry and Center of Biomolecular Magnetic Resonance, Goethe University Frankfurt, Max-von-Laue Str. 7, 60437, Frankfurt am Main, Germany.

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|October 18, 2023
PubMed
Summary

Pulse electron double resonance (PELDOR) reveals spin-spin distances. New findings show sample shape and orientation influence PELDOR signals, offering deeper insights into this electron spin resonance technique.

Keywords:
DEEREPRHigh fieldHigh polarizationLow temperaturesPELDOR

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Area of Science:

  • Electron Paramagnetic Resonance Spectroscopy
  • Solid-State Physics
  • Materials Science

Background:

  • Pulse electron double resonance (PELDOR), also known as double electron-electron resonance (DEER), measures electron spin dipolar interactions.
  • This technique is crucial for determining spin-spin distance distributions in various solid materials.
  • Previous studies noted PELDOR signals gain an out-of-phase component under high spin polarization conditions (low temperatures, high fields).

Purpose of the Study:

  • To investigate the influence of macroscopic sample shape and orientation on PELDOR signals.
  • To understand the underlying physics of the out-of-phase component in PELDOR.
  • To provide new insights into the fundamental principles of PELDOR.

Main Methods:

  • Theoretical modeling of PELDOR signal behavior.
  • Experimental validation of theoretical predictions.
  • Analysis of electron spin dipolar interactions.

Main Results:

  • The out-of-phase component of PELDOR signals is demonstrably dependent on sample shape and orientation.
  • Dipolar interactions between distant spins are identified as the cause of this observed effect.
  • The magnitude and sign of the effect are directly linked to sample geometry and magnetic field alignment.

Conclusions:

  • Sample shape and orientation are critical factors affecting PELDOR measurements.
  • This dependence offers a new avenue for understanding PELDOR signal artifacts and physics.
  • The findings enhance the interpretation and application of PELDOR spectroscopy in materials science.