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Related Concept Videos

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...
Bandpass Sampling01:17

Bandpass Sampling

In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2. The spectrum...
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in the 3500–3100 cm−1 range. Even though both O−H and N−H bonds vibrate at a similar...
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession, and the angular frequency...

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Related Experiment Video

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Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels
11:19

Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels

Published on: July 4, 2016

W-band frequency-swept EPR.

James S Hyde1, Robert A Strangeway, Theodore G Camenisch

  • 1National Biomedical EPR Center, Department of Biophysics, Medical College of Wisconsin, Milwaukee, WI 53226, USA. jshyde@mcw.edu

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|May 14, 2010
PubMed
Summary
This summary is machine-generated.

This study introduces a new Electron Paramagnetic Resonance (EPR) experiment for nitroxide radicals using a W-band bridge and loop-gap resonator. This method allows for EPR spectroscopy via microwave frequency sweeps, offering advantages over traditional magnetic field modulation.

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

Published on: April 24, 2014

Area of Science:

  • Magnetic Resonance Spectroscopy
  • Chemical Physics
  • Spectroscopic Techniques

Background:

  • Electron Paramagnetic Resonance (EPR) spectroscopy is crucial for studying radical species.
  • Traditional EPR methods often rely on magnetic field modulation, which can introduce artifacts.
  • Developing advanced EPR techniques is essential for higher resolution and sensitivity.

Purpose of the Study:

  • To demonstrate a novel EPR spectroscopy experiment using a multiarm W-band bridge and loop-gap resonator (LGR).
  • To explore the feasibility of performing EPR spectroscopy by sweeping microwave frequency instead of magnetic field.
  • To investigate the potential for Fourier Transform (FT) EPR using frequency sweep techniques.

Main Methods:

  • Utilized a multiarm EPR W-band bridge coupled with a loop-gap resonator (LGR).
  • Employed a frequency-tunable yttrium iron garnet (YIG) oscillator for rapid microwave frequency sweeps.
  • Analyzed nitroxide radical spin labels using linear and pulsed frequency sweep methods.

Main Results:

  • Successfully demonstrated EPR spectroscopy of spin labels via linear microwave frequency sweeps.
  • Achieved pure absorption and dispersion spectra in a slow sweep mode, eliminating magnetic field modulation.
  • Observed oscillating Free Induction Decay (FID) signals in a pulsed sweep mode, though insufficient for full FT EPR.

Conclusions:

  • The developed LGR and frequency sweep method enable practical EPR spectroscopy for spin labels.
  • While full FT EPR was not achieved, the study supports trapezoidal frequency sweep as a key enabling technology.
  • Further technical advancements are needed to realize the full potential of FT EPR through frequency sweeping.