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Related Concept Videos

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...
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.
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...
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.
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

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.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...

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Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR
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Low-dissipation tunable rf preamplifier for low temperature NMR applications.

H R Wampach1, N S Sullivan

  • 1Service de Physique du Solide et de Résonance Magnetique, Centre d'Etudes Nucléaires de Saclay, BP no. 2, Gif-sur-Yyette, France.

The Review of Scientific Instruments
|December 1, 1978
PubMed
Summary

A novel impedance matching circuit enhances signal-to-noise ratio in low-temperature Nuclear Magnetic Resonance (NMR) experiments using lossy cables. This low-dissipation circuit operates effectively down to 1.5 K.

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Area of Science:

  • Low-temperature physics
  • Nuclear Magnetic Resonance (NMR) spectroscopy
  • Electrical engineering

Background:

  • Lossy cables in low-temperature Nuclear Magnetic Resonance (NMR) experiments degrade signal-to-noise ratio (S/N).
  • Traditional impedance matching methods may be unsuitable for cryogenic environments.

Purpose of the Study:

  • To present a simple impedance matching circuit for low-temperature NMR.
  • To improve the S/N ratio in experiments utilizing lossy cables at cryogenic temperatures.

Main Methods:

  • Development of a low-dissipation ( < 2 mW) impedance matching circuit.
  • Integration of Gallium Arsenide Phosphide (GaAs P) diodes for remote tuning.
  • Testing the circuit's performance in Nuclear Magnetic Resonance (NMR) experiments down to 1.5 K.

Main Results:

  • The circuit effectively improves the S/N ratio in low-temperature NMR setups.
  • Satisfactory operation was achieved at temperatures as low as 1.5 K.
  • The circuit incorporates remotely tunable GaAs P diodes within the nuclear resonance circuit.

Conclusions:

  • The developed impedance matching circuit is a viable solution for enhancing NMR sensitivity in challenging low-temperature conditions.
  • The circuit's low power consumption and wide operating temperature range make it suitable for various cryogenic NMR applications.
  • Remote tunability offers practical advantages for experimental setup and optimization.