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Related Concept Videos

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

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Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
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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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Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...
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In proton NMR spectroscopy, primary amines and secondary amines showcase their N–H protons as a broad signal in the chemical shift range between δ 0.5 and 5 ppm. The exact position in this range depends on several factors, including sample concentration, hydrogen bonding, and the type of solvent used. Since amine protons undergo fast proton exchange in solution, the protons are labile and therefore do not participate in any splitting with adjacent protons. Thus, the observed peak is...
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Once data is collected from both the experimental and the control groups, a statistical analysis is conducted to find out if there are meaningful differences between the two groups. A statistical analysis determines how likely any difference found is due to chance (and thus not meaningful). In psychology, group differences are considered meaningful, or significant, if the odds that these differences occurred by chance alone are 5 percent or less. Stated another way, if we repeated this...
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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Quantum Memory Enhanced Multipoint Correlation Spectroscopy for Statistically Polarized NMR.

Tobias Spohn1, Nicolas Staudenmaier1, Philipp J Vetter1

  • 1Ulm University, Institute of Quantum Optics and Center for Integrated Quantum Science and Technology (IQST), Albert-Einstein-Allee 11, 89081 Ulm, Germany.

Physical Review Letters
|January 20, 2026
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Summary
This summary is machine-generated.

Multipoint correlation spectroscopy enhances nanoscale nuclear magnetic resonance (NMR) sensitivity using spin ensembles. This novel method improves measurements of statistically polarized nuclear spins, achieving high frequency precision.

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Area of Science:

  • Quantum sensing
  • Spectroscopy
  • Nanoscale science

Background:

  • Solid-state spin sensors offer promising nanoscale nuclear spin detection.
  • Leveraging spin ensembles enhances sensitivity for statistically polarized nuclear spins.

Purpose of the Study:

  • Introduce multipoint correlation spectroscopy for temporally efficient nanoscale measurements.
  • Combine correlation spectroscopy and quantum heterodyne detection for enhanced sensitivity.

Main Methods:

  • Developed a theoretical framework for multipoint correlation spectroscopy.
  • Experimental proof of concept using a nitrogen vacancy center in diamond.
  • Utilized spin ensembles for signal detection.

Main Results:

  • Demonstrated temporally efficient measurements of statistically polarized samples.
  • Achieved single hertz uncertainty in estimated signal frequency.
  • Validated the technique with a nitrogen vacancy center in diamond.

Conclusions:

  • Multipoint correlation spectroscopy enables sensitive nanoscale NMR with spin ensembles.
  • The technique offers potential for advanced applications in nanoscale magnetic resonance.
  • High frequency precision achieved highlights the method's effectiveness.