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Related Concept Videos

Nuclear Magnetic Resonance (NMR): Overview01:07

Nuclear Magnetic Resonance (NMR): Overview

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Nuclear magnetic resonance (NMR) is a phenomenon exhibited by certain nuclei that can absorb characteristic radio frequency radiation under certain conditions. NMR has been extensively applied in molecular spectroscopy and medical diagnostic imaging. In both these applications, the molecule or subject under study is placed in a magnetic field and irradiated with radio frequency energy.
NMR spectroscopy generates a spectrum where the characteristic absorption frequencies of the sample are...
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Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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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...
1.2K
Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

3.3K
All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
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Nuclear Fusion02:45

Nuclear Fusion

33.9K
The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons.
A helium nucleus has a mass that is 0.7% less than that of four hydrogen nuclei; this lost mass is converted into energy during the fusion. This reaction produces about...
33.9K
Metallic Solids02:37

Metallic Solids

21.0K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Exploring the Arginine Methylome by Nuclear Magnetic Resonance Spectroscopy
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Recent Advances in Solid-State Nuclear Magnetic Resonance Spectroscopy.

Sharon E Ashbrook1, John M Griffin2, Karen E Johnston3

  • 1School of Chemistry, EaStCHEM and Centre of Magnetic Resonance, University of St. Andrews, St. Andrews KY16 9ST, United Kingdom;

Annual Review of Analytical Chemistry (Palo Alto, Calif.)
|January 12, 2018
PubMed
Summary
This summary is machine-generated.

Solid-state nuclear magnetic resonance (NMR) spectroscopy offers detailed insights into materials. Research focuses on improving spectral resolution and sensitivity for broader chemical science applications.

Keywords:
NMR crystallographyhigh-resolution spectroscopyin situsensitivity enhancementsolid-state NMR

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Area of Science:

  • Solid-state chemistry
  • Materials science
  • Spectroscopy

Background:

  • Nuclear magnetic resonance (NMR) spectroscopy is sensitive to local atomic environments.
  • Solid-state NMR provides rich structural information but suffers from spectral line broadening due to anisotropic interactions.
  • Enhancing solid-state NMR resolution is key to unlocking its full potential.

Purpose of the Study:

  • To review methods for improving solid-state NMR spectral resolution.
  • To highlight ongoing research and future developments in the field.
  • To demonstrate the utility of solid-state NMR for studying dynamic and disordered solids.

Main Methods:

  • Review of spectral resolution enhancement techniques in solid-state NMR.
  • Discussion of experimental and theoretical calculation combinations.
  • Exploration of polarization transfer techniques and in situ measurements.

Main Results:

  • Methods exist to overcome spectral broadening in solid-state NMR.
  • Advanced techniques like polarization transfer significantly enhance sensitivity.
  • In situ measurements and combined experimental-theoretical approaches are emerging.

Conclusions:

  • Solid-state NMR is a powerful tool for characterizing diverse solid materials.
  • Continued research promises broader applications in chemical sciences.
  • Improved resolution and sensitivity will increase the recognition of solid-state NMR.