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Related Concept Videos

Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule01:10

Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule

In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the others.
NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

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...
Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse.
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.
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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Related Experiment Video

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Simultaneous Data Collection of fMRI and fNIRS Measurements Using a Whole-Head Optode Array and Short-Distance Channels
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A single-chip array of NMR receivers.

Jens Anders1, Giuseppe Chiaramonte, Paul SanGiorgio

  • 1Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland. jens.anders@epfl.ch

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|October 20, 2009
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel single-chip Nuclear Magnetic Resonance (NMR) receiver array for enhanced parallel spectroscopy and imaging. This compact, eight-channel device offers high sensitivity for advanced NMR applications.

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Area of Science:

  • Physics
  • Engineering
  • Chemistry

Background:

  • Nuclear Magnetic Resonance (NMR) is a powerful technique for molecular structure determination and imaging.
  • Current NMR systems often require bulky and complex receiver electronics.
  • Parallel acquisition techniques can accelerate NMR experiments but require specialized hardware.

Purpose of the Study:

  • To develop and characterize the first single-chip integrated NMR receiver array.
  • To enable parallel spectroscopy and imaging with a compact and densely packed device.
  • To evaluate the performance and sensitivity of the integrated NMR receiver array.

Main Methods:

  • Fabrication of an eight-channel integrated NMR receiver array on a single chip.
  • Optimization of the array for operation at 300 MHz.
  • Integration of detection coils, tuning capacitors, low noise amplifiers, and buffers within each channel.
  • Characterization of the array's physical dimensions and spin sensitivity.

Main Results:

  • Successful development of the first single-chip integrated NMR receiver array.
  • The array features eight densely packed channels with integrated electronics beneath reception coils.
  • Each channel's reception coil has a diameter of 500 micrometers, yielding a 1 mm x 2 mm active area.
  • Achieved a (1)H time-domain spin sensitivity of approximately 1x10^15 spins/sqrt(Hz) per channel.

Conclusions:

  • The developed single-chip NMR receiver array represents a significant advancement in NMR hardware.
  • The compact design and high sensitivity facilitate parallel spectroscopy and imaging.
  • This technology has the potential to improve the efficiency and capabilities of NMR applications.