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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...
Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals01:17

Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals

Ideally, an unpaired electron shows a single peak in the EPR spectrum due to the transition between the two spin energy states. However, coupling interactions can occur between the spins of the unpaired electron and any neighboring spin-active nuclei. This hyperfine coupling results in hyperfine splitting, where the EPR signal is split into multiplets. The signals split into 2nI + 1 peaks, where n is the number of equivalent nuclei and I is the nuclear spin. These splitting patterns provide...
Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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...
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...
Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...

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Related Experiment Video

Updated: May 25, 2026

Exploring the Radical Nature of a Carbon Surface by Electron Paramagnetic Resonance and a Calibrated Gas Flow
10:34

Exploring the Radical Nature of a Carbon Surface by Electron Paramagnetic Resonance and a Calibrated Gas Flow

Published on: April 24, 2014

Electron spin resonance. Part two: a diagnostic method in the environmental sciences.

Christopher J Rhodes1

  • 1University of Reading. cjrhodes@fresh-lands.com

Science Progress
|February 8, 2012
PubMed
Summary
This summary is machine-generated.

Electron spin resonance (ESR) spectroscopy offers versatile applications in environmental science, from pollution control and material characterization to understanding biological processes and extraterrestrial samples. This review highlights ESR

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

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Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo
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Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo

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Related Experiment Videos

Last Updated: May 25, 2026

Exploring the Radical Nature of a Carbon Surface by Electron Paramagnetic Resonance and a Calibrated Gas Flow
10:34

Exploring the Radical Nature of a Carbon Surface by Electron Paramagnetic Resonance and a Calibrated Gas Flow

Published on: April 24, 2014

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

Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo
08:01

Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo

Published on: September 26, 2016

Area of Science:

  • Environmental Science
  • Chemistry
  • Physics
  • Geology
  • Biology

Background:

  • Electron spin resonance (ESR) spectroscopy is a powerful technique for studying systems with unpaired electrons.
  • Its applications extend across various scientific disciplines, offering unique insights into molecular structure, dynamics, and reactions.
  • This review consolidates diverse applications of ESR relevant to environmental sciences.

Purpose of the Study:

  • To provide a comprehensive overview of ESR spectroscopy's utility in environmental science.
  • To showcase the breadth of ESR applications, from pollution monitoring to astrobiology.
  • To highlight ESR's role in understanding complex environmental systems and materials.

Main Methods:

  • Quantitative ESR spectroscopy
  • ESR analysis of photocatalysis and sorption processes
  • Detection of free radicals and reactive oxygen species
  • ESR characterization of particulate matter, soils, and biogenic substances
  • ESR dating and analysis of extraterrestrial and geological samples

Main Results:

  • ESR effectively quantifies pollutants (PAHs, soot) and radicals in air and water.
  • It elucidates molecular mobility, lipid peroxidation, and the state of organic matter in soils and geological samples.
  • ESR aids in understanding plant stress responses, seed viability, and the characterization of materials like carbon black and fuel components.
  • Applications extend to space weathering, extraterrestrial sample analysis, and food/nutraceutical research.

Conclusions:

  • ESR spectroscopy is an indispensable tool for environmental science research, offering quantitative and qualitative analysis across diverse fields.
  • Its ability to detect and characterize paramagnetic species makes it crucial for pollution control, material science, and understanding biogeochemical processes.
  • Future applications of ESR in environmental monitoring, green chemistry, and astrobiology are promising.