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A new mechanism for electron spin echo envelope modulation.

John J L Morton1, Alexei M Tyryshkin, Arzhang Ardavan

  • 1Department of Materials, Oxford University, UK. john.morton@materials.ox.ac.uk

The Journal of Chemical Physics
|May 25, 2005
PubMed
Summary
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Electron spin echo envelope modulation (ESEEM) was observed for the first time in liquid solutions for coupled electron and nuclear spins. This new mechanism, seen in N@C(60), arises from second-order effects in hyperfine coupling.

Area of Science:

  • * Electron Paramagnetic Resonance Spectroscopy
  • * Quantum Chemistry
  • * Molecular Biophysics

Background:

  • * Spin echo experiments traditionally observe modulation for homonuclear spins (NMR) or resonant electron spins (EPR).
  • * Previous studies lacked observation of modulation effects from coupled heterospin pairs in liquid solutions.
  • * Electron spin echo envelope modulation (ESEEM) is a technique to study electron-nuclear interactions.

Purpose of the Study:

  • * To report the first observation of ESEEM from a coupled heterospin pair (electron-nucleus) in liquid solution.
  • * To identify and characterize a new mechanism responsible for low-frequency ESEEM.
  • * To investigate the role of second-order effects in isotropic hyperfine coupling.

Main Methods:

  • * Utilized electron spin echo spectroscopy.

Related Experiment Videos

  • * Studied the endohedral fullerene N@C(60) as a model system.
  • * Analyzed modulation frequencies in the ESEEM data.

    • Main Results:

    • * Observed low-frequency ESEEM signals at 26 and 52 kHz.
    • * Demonstrated a new ESEEM mechanism applicable to electron spins (S > 1/2) hyperfine coupled to nuclear spins.
    • * Attributed the modulation to second-order effects in the isotropic hyperfine coupling between the electron spin (S = 3/2) and the (14)N nucleus (I = 1).

    Conclusions:

    • * The study successfully observed ESEEM from a coupled heterospin pair in liquid solution for the first time.
    • * A novel mechanism for low-frequency ESEEM has been identified and characterized.
    • * This finding expands the applicability of ESEEM for studying electron-nuclear interactions in various systems.