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Related Concept Videos

Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
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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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NMR Spectroscopy: Spin–Spin Coupling01:08

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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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Double Resonance Techniques: Overview01:12

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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...
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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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Other Nuclides: 31P, 19F, 15N NMR01:16

Other Nuclides: 31P, 19F, 15N NMR

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Many organic, inorganic, and biological molecules contain spin-half nuclei such as nitrogen-15, fluorine-19, and phosphorus-31. As a result, NMR studies of these nuclei have found extensive applications in chemical and biological research.
While fluorine-19 and phosphorous-31 have high natural abundances (100%) and positive gyromagnetic ratios, nitrogen-15 has a low natural abundance and a negative gyromagnetic ratio. However, nitrogen-15 is still preferred over nitrogen-14 (which has a...
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Proton magnetic resonance imaging using a nitrogen-vacancy spin sensor.

D Rugar1, H J Mamin1, M H Sherwood1

  • 1IBM Research Division, Almaden Research Center, San Jose, California 95120, USA.

Nature Nanotechnology
|December 23, 2014
PubMed
Summary
This summary is machine-generated.

Researchers developed a new nanoscale magnetic resonance imaging technique using nitrogen-vacancy (NV) centers in diamond. This method achieves 12nm resolution for 2D imaging of proton nuclear magnetic resonance (NMR) at room temperature.

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Area of Science:

  • Nanosciences
  • Magnetic Resonance Imaging
  • Quantum Sensing

Background:

  • Magnetic resonance imaging (MRI) offers non-destructive 3D imaging but faces sensitivity limitations at the nanoscale.
  • Conventional techniques like magnetic resonance force microscopy require cryogenic temperatures.
  • Developing room-temperature nanoscale MRI is crucial for visualizing complex nanostructures.

Purpose of the Study:

  • To demonstrate a novel nanoscale MRI technique using nitrogen-vacancy (NV) centers in diamond.
  • To achieve high-resolution, non-destructive 2D imaging of molecular structures at room temperature.

Main Methods:

  • Utilized a single NV center in diamond as a sensor for detecting nuclear magnetic resonance (NMR).
  • Employed a scanning technique to map the oscillating magnetic field from precessing protons in a polymer sample.
  • Operated the system at room temperature, overcoming cryogenic limitations.

Main Results:

  • Achieved two-dimensional (2D) imaging of proton (1H) NMR signals.
  • Demonstrated a spatial resolution of approximately 12 nanometers (nm).
  • The resolution was primarily limited by the scanning precision.

Conclusions:

  • Nitrogen-vacancy (NV) centers in diamond provide a viable room-temperature platform for nanoscale MRI.
  • This technique offers a promising pathway for high-resolution imaging of nanostructures, including biomolecules.