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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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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...
241
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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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.
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NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

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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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NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

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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...
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NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

1.1K
NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
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Atomic Nuclei: Magnetic Resonance01:05

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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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Study of Protein Dynamics via Neutron Spin Echo Spectroscopy
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Neutron spin echo spectroscopy with a moving sample.

Manuchar Gvaramia1, Philipp Gutfreund2, Peter Falus3

  • 1Department for Physics and Astronomy, Uppsala University, Regementsvägen 1, SE-75120, Uppsala, Sweden.

Scientific Reports
|August 11, 2023
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Summary
This summary is machine-generated.

Neutron spin echo spectroscopy can now account for Doppler scattering from moving samples. This advancement enables detailed studies of polymer dynamics under high shear conditions.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Polymer Science

Background:

  • Neutron spin echo spectroscopy is a high-resolution technique for studying nanosecond dynamics.
  • It is crucial for understanding polymer dynamics and viscoelasticity.
  • Doppler scattering effects must be considered for moving samples, complicating analysis.

Purpose of the Study:

  • To investigate and quantify Doppler scattering effects in neutron spin echo spectroscopy.
  • To develop methods for correcting Doppler scattering in data analysis.
  • To enable the study of polymers under dynamic conditions like high shear.

Main Methods:

  • Neutron spin echo spectroscopy
  • Experimental measurement of phase shift and depolarization from a rotating graphite disk
  • Numerical and analytical calculations for Doppler scattering

Main Results:

  • Excellent agreement between experimental measurements and theoretical calculations of Doppler scattering.
  • Validation of a method to account for Doppler scattering effects.
  • Demonstration of extended capabilities for neutron spin echo spectroscopy.

Conclusions:

  • Accurate correction for Doppler scattering is achievable in neutron spin echo spectroscopy.
  • This method expands the applicability of the technique to dynamic systems, including polymers under high shear.
  • Enhanced data analysis opens new avenues for materials research.