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関連する概念動画

NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

1.3K
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...
1.3K
NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

774
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...
774
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

915
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.
915
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

291
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...
291
Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

705
The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
705
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

530
A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
530

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関連する実験動画

Updated: Sep 10, 2025

Hyperpolarized Xenon for NMR and MRI Applications
16:20

Hyperpolarized Xenon for NMR and MRI Applications

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高速,高メモリNMRスペクトロメーターとハイパーポラライザー

Leo Joon Il Moon1, William Beatrez2, Jason Ball3

  • 1Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720, USA; Chemical Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.

Journal of magnetic resonance (San Diego, Calif. : 1997)
|August 24, 2025
PubMed
まとめ

新しい核磁共振 (NMR) スペクトロメーターは,高度な電子核スピン制御とダイナミック核極化 (DNP) のための高速任意波形トランシーバー (AWT) を使用しています. これは信号対ノイズ比を向上させ 量子センシングの新たな可能性を開きます

キーワード:
任意の波形トランシーバーダイナミクス 核極化電子核スピン制御インターポレーションとデシメーション段階感知検出パルスシーケンスのプログラミング量子センシング

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Measuring the Spin-Lattice Relaxation Magnetic Field Dependence of Hyperpolarized [1-13C]pyruvate
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Measuring the Spin-Lattice Relaxation Magnetic Field Dependence of Hyperpolarized [1-13C]pyruvate

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Hyperpolarized 13C Metabolic Magnetic Resonance Spectroscopy and Imaging
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Hyperpolarized 13C Metabolic Magnetic Resonance Spectroscopy and Imaging

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Hyperpolarized Xenon for NMR and MRI Applications
16:20

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Measuring the Spin-Lattice Relaxation Magnetic Field Dependence of Hyperpolarized [1-13C]pyruvate
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Measuring the Spin-Lattice Relaxation Magnetic Field Dependence of Hyperpolarized [1-13C]pyruvate

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Hyperpolarized 13C Metabolic Magnetic Resonance Spectroscopy and Imaging
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Hyperpolarized 13C Metabolic Magnetic Resonance Spectroscopy and Imaging

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科学分野:

  • スペクトロスコーピー
  • 量子センシング
  • 材料科学

背景:

  • 核磁共振 (NMR) スペクトロスコピーは,分子構造とダイナミクスを分析するための強力なツールです.
  • ダイナミック・ニュクレア・ポラライゼーション (DNP) は,電子スピンから核スピンに偏振を移すことで,NMRの感受性を高めます.
  • 現在のNMRシステムは,パルス制御速度と信号処理の制限に直面しており,先進的なアプリケーションを妨げています.

研究 の 目的:

  • 電子核スピン制御とDNP機能を統合した新しいNMRスペクトロメーターを開発する.
  • 高速任意波形トランシーバー (AWT) を利用して,NMR性能を向上させる.
  • NMRパルス制御,DNP,および量子センシングアプリケーションの新しい道を探求する.

主な方法:

  • 高速任意波形トランシーバー (AWT) の組み込み - タボル・プロテウス P9484M
  • 電子核スピン制御とダイナミック核極化 (DNP) の最適化.
  • NMR操作の高速サンプリングレート (9Gs/s),大容量メモリ (16GB),高データ転送 (6Gs/s) を利用する.

主要な成果:

  • ~2.7GHzまでのLarmor周波数で直接NMRパルス合成と信号受信を可能にし,ヘテロダイニングを排除することによって信号対ノイズ比 (SNR) を改善します.
  • 機内,数値制御オシレータ (NCO) を使用した相感知検出.
  • 原子核のスピンダイナミクスを調べるため, 長い時間,数百万のパルスを取得しやすくした.

結論:

  • 新しいNMRスペクトロメーターアーキテクチャは,NMRパルス制御とDNPの高度な機能を提供します.
  • このシステムは,閉ループフィードバック制御,電子解離,および3Dスピン追跡をサポートしています.
  • 量子センシングと高度な材料分析における潜在的な応用が強調されています.