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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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2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

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Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
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NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

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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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2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

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Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
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NMR Spectroscopy Of Amines01:19

NMR Spectroscopy Of Amines

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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...
9.1K
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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Related Experiment Video

Updated: Aug 2, 2025

High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy
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High-Resolution NMR Spectroscopy at Large Fields with Nitrogen Vacancy Centers.

C Munuera-Javaloy1,2, A Tobalina1,2, J Casanova1,2,3

  • 1Department of Physical Chemistry, University of the Basque Country UPV/EHU, Apartado 644, 48080 Bilbao, Spain.

Physical Review Letters
|April 17, 2023
PubMed
Summary
This summary is machine-generated.

Nitrogen-vacancy (NV) centers can now detect nuclear magnetic resonance signals from small samples at high magnetic fields. This new method improves spectral resolution for sensitive nanoscale sensing applications.

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Area of Science:

  • Quantum sensing
  • Nanoscale nuclear magnetic resonance (NMR)
  • Solid-state physics

Background:

  • Nitrogen-vacancy (NV) centers in diamond are sensitive quantum sensors.
  • NV centers can detect nuclear magnetic resonance (NMR) signals from small samples at room temperature.
  • High magnetic fields enhance NMR signals but pose challenges for NV-based detection.

Purpose of the Study:

  • To develop a method for detecting NMR signals from micron-sized samples at high magnetic fields using NV centers.
  • To overcome the technical difficulties of coupling NV-based sensors with high-frequency nuclear signals.
  • To achieve high spectral resolution in nanoscale NMR sensing.

Main Methods:

  • A novel method was developed to map energy shifts in induced nuclear spin signals.
  • The nuclear spin signal is transferred to the NV sensor.
  • The method incorporates free-precession periods for sample nuclear spins, decoupling them from the sensor.

Main Results:

  • The developed method successfully detects NMR signals from micron-sized samples at high magnetic fields.
  • High spectral resolution is achieved, limited primarily by nuclear spin coherence.
  • The technique enables exploration of the high magnetic field regime for NV-based NMR.

Conclusions:

  • This work presents a breakthrough in nanoscale NMR sensing using NV centers at high magnetic fields.
  • The method offers a pathway to enhanced sensitivity and spectral resolution for studying small samples.
  • This advancement opens new possibilities for chemical shift and J coupling analysis in micro- and nanoscale systems.