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Related Concept Videos

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.
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...
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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...
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...

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Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo
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Published on: September 26, 2016

A new pulse width reduction technique for pulsed electron paramagnetic resonance spectroscopy.

Yasunori Ohba1, Shigeaki Nakazawa, Shunji Kazama

  • 1Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aobaku, Sendai 980-8577, Japan. yohba@tagen.tohoku.ac.jp

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|February 6, 2008
PubMed
Summary

A new microwave pulse modulator technique uses a frequency multiplier to create 1ns pulses for electron paramagnetic resonance (EPR) spectroscopy. This method successfully generated spin echo signals in a Ku band pulsed EPR spectrometer.

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Area of Science:

  • Microwave Engineering
  • Spectroscopy
  • Pulsed Electron Paramagnetic Resonance (EPR)

Background:

  • Short microwave pulses are crucial for advanced spectroscopic techniques like pulsed EPR.
  • Existing pulse modulator designs may have limitations in rise/fall times and bandwidth.
  • Continuous wave (CW) components are sometimes adapted for pulsed applications.

Purpose of the Study:

  • To develop a novel microwave pulse modulator for generating sub-nanosecond pulses.
  • To adapt a quadruple-frequency multiplier for pulsed signal generation in EPR.
  • To improve the performance of pulsed EPR spectrometers.

Main Methods:

  • Utilized a PIN diode switch to prepare an initial microwave pulse.
  • Employed a quadruple-frequency multiplier (4-5GHz to 16-20GHz) to shorten pulse rise and fall times.
  • Investigated the transient response of a commercial frequency multiplier for pulsed operation.
  • Integrated the technique into a Ku band pulsed EPR spectrometer.

Main Results:

  • Demonstrated that a commercial frequency multiplier, designed for CW, can effectively operate with pulsed signals.
  • Successfully generated microwave pulses with approximately 1ns duration.
  • Observed a spin echo signal in a Ku band pulsed EPR spectrometer.
  • Achieved a broad excitation bandwidth of approximately 1.6mT using 1.5ns pulses.

Conclusions:

  • The developed technique enables the generation of short microwave pulses suitable for pulsed EPR.
  • Frequency multipliers can be repurposed for pulsed applications, expanding their utility.
  • The technique enhances the capabilities of pulsed EPR spectrometers, allowing for broader bandwidth excitation.