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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved in...
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...

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Related Experiment Video

Updated: Jun 7, 2026

Electron Spin Resonance Micro-imaging of Live Species for Oxygen Mapping
09:40

Electron Spin Resonance Micro-imaging of Live Species for Oxygen Mapping

Published on: August 26, 2010

Sensitive surface loop-gap microresonators for electron spin resonance.

Ygal Twig1, Ekaterina Suhovoy, Aharon Blank

  • 1Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa 32000, Israel.

The Review of Scientific Instruments
|November 2, 2010
PubMed
Summary
This summary is machine-generated.

New microresonators significantly enhance electron spin resonance (ESR) sensitivity. These U-shaped gold devices offer improved performance for ESR measurements and could enable faster, lower-power experiments.

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Last Updated: Jun 7, 2026

Electron Spin Resonance Micro-imaging of Live Species for Oxygen Mapping
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Published on: August 26, 2010

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Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing
08:12

Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing

Published on: March 13, 2013

Area of Science:

  • Physics
  • Materials Science
  • Chemistry

Background:

  • Electron Spin Resonance (ESR) is a powerful technique for studying materials with unpaired electrons.
  • Improving the sensitivity and performance of ESR resonators is crucial for advancing research in various scientific fields.
  • Existing microresonator designs face limitations in sensitivity and sample accommodation.

Purpose of the Study:

  • To design, construct, and experimentally test novel sensitive surface loop-gap microresonators for ESR.
  • To improve absolute spin sensitivity and microwave field-power conversion ratio compared to previous designs.
  • To enable flexible sample placement and adjustable coupling properties for enhanced experimental control.

Main Methods:

  • Fabrication of U-shaped gold microresonators on a rutile substrate.
  • Utilizing a microstrip line for rear feeding of the resonators.
  • Experimental testing to evaluate sensitivity and microwave field-power conversion.

Main Results:

  • Achieved a volume reduction leading to over a twofold improvement in absolute spin sensitivity.
  • Demonstrated a high microwave field-power conversion ratio of up to 86 gauss/√Hz.
  • Confirmed variable coupling properties and accommodation for large flat samples.

Conclusions:

  • The developed microresonators offer superior performance for ESR measurements.
  • The design facilitates the use of short excitation pulses with lower microwave power.
  • Further enhancements in sensitivity are possible with this microresonator architecture.