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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...
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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.
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...
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...

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Updated: Jun 21, 2026

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
14:55

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy

Published on: September 17, 2017

Incomplete double frequency sweeps to select small quadrupolar coupling static powder patterns.

Xuefeng Wang1, Luis J Smith

  • 1Carlson School of Chemistry and Biochemistry, Clark University, 950 Main Street, Worcester, MA 01610, USA.

Solid State Nuclear Magnetic Resonance
|August 8, 2009
PubMed
Summary
This summary is machine-generated.

This study introduces a novel NMR method to isolate and analyze specific sites in complex materials. The technique simplifies spectral data, enabling accurate extraction of chemical shift anisotropy (CSA) information for smaller electric field gradient (EFG) environments.

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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
08:22

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

Published on: August 6, 2018

Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Materials Science
  • Quantum Chemistry

Background:

  • Analyzing complex solid-state materials with multiple NMR-active sites presents challenges.
  • Distinguishing signals from sites with small electric field gradients (EFGs) requires specialized techniques.
  • Extracting detailed chemical information like chemical shift anisotropy (CSA) is crucial for material characterization.

Purpose of the Study:

  • To develop a novel NMR pulse sequence for enhancing signals from specific sites in complex solid samples.
  • To enable the simplification of static lineshape data for easier analysis.
  • To facilitate the extraction of chemical shift anisotropy (CSA) information from challenging EFG environments.

Main Methods:

  • Utilized a double frequency sweep pulse sequence under static conditions.
  • Employed convergent sweeps targeting inner satellite transitions of smaller EFG sites.
  • Generated difference spectra by combining specialized echo spectra with normal echo spectra.
  • Demonstrated the method using (93)Nb NMR on mixed-compound and crystallographically complex samples.

Main Results:

  • Successfully enhanced the central transition signal for small EFG environments.
  • Created difference spectra that predominantly feature signals from the targeted smaller EFG site.
  • Simplified static lineshape data, allowing for accurate simulation.
  • Extracted chemical shift anisotropy (CSA) information from complex (93)Nb-containing materials.

Conclusions:

  • The developed NMR method effectively isolates and simplifies spectral data from specific sites in heterogeneous materials.
  • This technique provides a reliable approach for extracting CSA parameters, even in the presence of multiple, complex EFG environments.
  • The method holds significant potential for the characterization of advanced materials using solid-state NMR.