Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

The continuous wave electron paramagnetic resonance experiment revisited.

Moritz Kälin1, Igor Gromov, Arthur Schweiger

  • 1Physical Chemistry, ETH Zürich, CH-8093 Zürich, Switzerland. kaelin@phys.chem.ethz.ch

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|March 5, 2003
PubMed
Summary

Modulation sidebands in continuous wave electron paramagnetic resonance (cw EPR) spectroscopy are revealed as multiple photon transitions. These transitions explain spectral line shapes and overmodulation distortions in cw EPR experiments.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

<sup>1</sup>H high field electron-nuclear double resonance spectroscopy at 263 GHz/9.4 T.

Journal of magnetic resonance (San Diego, Calif. : 1997)·2019
Same author

[Injuries in Floorball: a Questionnaire Survey in Swiss National League A Floorball Players].

Sportverletzung Sportschaden : Organ der Gesellschaft fur Orthopadisch-Traumatologische Sportmedizin·2019
Same author

A Monomeric d<sup>9</sup> -Rhodium(0) Complex.

Angewandte Chemie (International ed. in English)·2018
Same author

On the Origin of the Low-Spin Character of Cytochrome P450<sub>cam</sub> in the Resting State-Investigations of Enzyme Models with Pulse EPR and ENDOR Spectroscopy.

Angewandte Chemie (International ed. in English)·2018
Same author

Facile C-H bond cleavage via a proton-coupled electron transfer involving a C-H...Cu(II) interaction.

Journal of the American Chemical Society·2010
Same author

A nickel hydride complex in the active site of methyl-coenzyme m reductase: implications for the catalytic cycle.

Journal of the American Chemical Society·2008

Area of Science:

  • Spectroscopy
  • Quantum Mechanics
  • Physical Chemistry

Background:

  • Continuous wave electron paramagnetic resonance (cw EPR) spectroscopy is a powerful technique for studying paramagnetic species.
  • Modulation sidebands can appear in cw EPR spectra when the modulation frequency exceeds the spectral linewidth.
  • The origin and impact of these sidebands on spectral interpretation have not been fully elucidated.

Purpose of the Study:

  • To theoretically and experimentally investigate the nature of modulation sidebands in cw EPR spectroscopy.
  • To demonstrate that these sidebands are multiple photon transitions involving microwave and radio frequency fields.
  • To explain how these sidebands influence spectral line shapes and overmodulation distortions.

Main Methods:

  • Theoretical analysis using semiclassical and second quantization approaches.

Related Experiment Videos

  • Derivation of effective Hamiltonians for sideband transitions.
  • Experimental verification of theoretical predictions on sideband intensities and lineshapes.
  • Comparison with frequency-modulation EPR techniques.

    • Main Results:

    • Sidebands are identified as multiple photon transitions (sigma(+) + k*pi).
    • Unresolved sidebands are the cause of standard cw EPR derivative lineshapes and overmodulation distortions.
    • Single-photon transitions do not contribute to the first-harmonic cw EPR signal.
    • Theoretical models accurately predict sideband intensities and dependencies on radio frequency amplitude and saturation.

    Conclusions:

    • The study provides a comprehensive understanding of modulation sidebands in cw EPR.
    • The findings clarify the fundamental origins of spectral features and distortions in cw EPR.
    • Field-modulation and frequency-modulation EPR techniques are shown to be non-equivalent.