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Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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...
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis. This...
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.
Atomic Nuclei: Types of Nuclear Relaxation01:28

Atomic Nuclei: Types of Nuclear Relaxation

Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers energy to a nearby...
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...
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

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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関連する実験動画

Updated: Jul 10, 2026

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

ゼオライト結晶構造の溶液のための固体NMR法.

Darren H Brouwer1, Richard J Darton, Russell E Morris

  • 1School of Chemistry, University of Southampton, Southampton, SO17 1BJ, United Kingdom.

Journal of the American Chemical Society
|July 21, 2005
PubMed
まとめ
この要約は機械生成です。

ゼオライトの構造を決定することは困難です. 新しい方法では,粉末X線微分法 (XRD) と核磁共振 (NMR) のスペクトロスコピーを組み合わせて,複雑なゼオライト結晶構造を解析しています.

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High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy
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High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy

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Last Updated: Jul 10, 2026

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

Cryogenic Sample Loading into a Magic Angle Spinning Nuclear Magnetic Resonance Spectrometer that Preserves Cellular Viability
06:42

Cryogenic Sample Loading into a Magic Angle Spinning Nuclear Magnetic Resonance Spectrometer that Preserves Cellular Viability

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High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy
08:55

High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy

Published on: October 9, 2020

科学分野:

  • 材料科学 材料科学とは
  • 固体化学 固体化学
  • クリスタログラフィーです.

背景:

  • ゼオライトの構造の決定は,通常,粉末X線 difraktion (XRD) に依存しています.
  • 粉末XRDデータからゼオライト構造を解明することは,相問題と反射の重なりによる課題です.

研究 の 目的:

  • 複雑なゼオライト結晶構造を解決するための新しい方法を開発する.
  • ゼオライト構造の決定のための伝統的な粉末XRD方法の限界を克服するために.

主な方法:

  • 粉末X線 difraktion (XRD) と固体核磁気共振 (NMR) のスペクトロスコピーの統合である.
  • (29) Si二重量子二極再結合NMRを用いて,ゼオライトの枠組み内のSi-Si距離を調査する.
  • NMRから派生した構造情報をユニットセルパラメータとスペースグループと組み合わせる.

主要な成果:

  • 2つの純粋なシリシアスゼオライトのブラインドテストサンプルの構造モデルの解決に成功しました.
  • 構造溶液に対するXRDとNMRの組み合わせアプローチの有効性を実証しました.
  • 粉末XRDデータに対して解決された構造モデルの精製を成功裏に達成しました.

結論:

  • 粉末XRDとNMRスペクトロスコピーの組み合わせは,ゼオライト構造の決定に堅実なアプローチを提供します.
  • この統合技術は,複雑なゼオライト構造を解決する上で重要な課題を克服します.
  • この方法は,ゼオライトの性質と応用を理解するために不可欠な正確な構造モデリングを容易にする.