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Related Concept Videos

The Hall Effect01:30

The Hall Effect

Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
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...
Chemical Shift: Internal References and Solvent Effects01:17

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In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
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NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

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...
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...
¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.

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High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy
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A Hall effect angle detector for solid-state NMR.

Salvatore Mamone1, André Dorsch, Ole G Johannessen

  • 1School of Chemistry, University of Southampton, Southampton SO17 1BJ, UK.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|October 4, 2007
PubMed
Summary
This summary is machine-generated.

A novel Hall effect sensor method enables precise, non-mechanical monitoring of the angle between the spinning axis and magnetic field in solid-state Nuclear Magnetic Resonance (NMR) experiments.

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy
  • Applied physics and sensor technology

Background:

  • Accurate monitoring of the spinning axis angle relative to the magnetic field is crucial for solid-state NMR.
  • Existing methods may be mechanical or interfere with the NMR experiment.

Purpose of the Study:

  • To develop and present a new, independent method for monitoring the angle between the spinning axis and magnetic field in solid-state NMR.
  • To enable non-mechanical and experiment-independent angle measurements.

Main Methods:

  • Integration of a Hall effect magnetic flux sensor onto the NMR rotor's spinning housing.
  • Measurement of Hall voltage changes, which correlate directly with the angle between the Hall sensor's plane and the static magnetic field.
  • External measurement of Hall voltage using a precision voltmeter.

Main Results:

  • The Hall voltage output is directly proportional to changes in the angle between the spinning axis and the magnetic field.
  • Achieved an angular accuracy of approximately 10 millidegrees.
  • Demonstrated that optimal sensor orientation enhances sensitivity to stator orientation changes.

Conclusions:

  • The described Hall effect sensor method provides a reliable and independent means for monitoring the spinning angle in solid-state NMR.
  • This technique offers a non-mechanical alternative to traditional angle measurement methods.
  • Further precautions can be implemented to achieve even higher angular precision.