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Related Experiment Videos

Multiphoton resonances in pulse EPR

Gromov1, Schweiger

  • 1Laboratory for Physical Chemistry, ETH-Zentrum, Swiss Federal Institute of Technology, Zurich, CH-8092, Switzerland.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|September 2, 2000
PubMed
Summary

Researchers observed two- and three-photon electron spin echoes using microwave and radio-frequency fields. This multiphoton echo phenomenon occurs when photon energies match spin state energy differences, extending Floquet theory for even photon participation.

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Area of Science:

  • Quantum Mechanics
  • Solid-State Physics
  • Spectroscopy

Background:

  • Electron spin echoes are crucial for studying quantum systems.
  • Multiphoton processes are typically observed with an odd number of photons.
  • Understanding spin dynamics requires precise control of excitation fields.

Purpose of the Study:

  • To observe and characterize two- and three-photon electron spin echoes.
  • To investigate the role of combined microwave and radio-frequency fields in generating spin echoes.
  • To extend theoretical frameworks like Floquet theory to accommodate even-photon processes.

Main Methods:

  • Utilized microwave and linearly polarized radio-frequency (RF) fields for excitation.
  • Oriented the RF field parallel to the static magnetic field (B(0)).

Related Experiment Videos

  • Measured spin nutation frequency and echo amplitude as functions of field angles and strengths.

    • Main Results:

    • Successfully observed two- and three-photon electron spin echoes in a two-level system.
    • Confirmed multiphoton character by analyzing spin nutation and echo amplitude dependencies.
    • Demonstrated that multiphoton echoes occur when combined photon energies match spin state energy differences.

    Conclusions:

    • The study successfully observed and characterized novel multiphoton electron spin echoes.
    • The findings extend the applicability of Floquet theory to systems involving an even number of photons.
    • This work provides new insights into controlling and manipulating spin states using multi-frequency fields.