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Related Concept Videos

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...
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
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...
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.
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...

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Cryogenic Sample Loading into a Magic Angle Spinning Nuclear Magnetic Resonance Spectrometer that Preserves Cellular Viability
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Development of a cryogenic duplexer for solid-state nuclear magnetic resonance.

Takashi Mizuno1, K Takegoshi

  • 1JEOL Ltd., 1-2 Musashino 3-Chome, Akishima, Tokyo 196-8558, Japan. tmizuno@jeol.co.jp

The Review of Scientific Instruments
|January 12, 2010
PubMed
Summary

A new cryogenic duplexer significantly enhances nuclear magnetic resonance (NMR) sensitivity by reducing thermal noise. This advancement enables a 4.0-fold signal-to-noise ratio gain in proton magic-angle spinning NMR experiments.

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Area of Science:

  • Physics
  • Engineering
  • Chemistry

Background:

  • Reducing thermal noise in detection coils is crucial for enhancing sensitivity in Nuclear Magnetic Resonance (NMR).
  • Cryogenic operation of components like duplexers is essential for minimizing thermal noise.
  • Existing NMR systems can benefit from improved sensitivity for both liquid and solid-state analyses.

Purpose of the Study:

  • To develop a cryogenic duplexer capable of operating below 50 K for NMR applications.
  • To evaluate the performance of the cryogenic duplexer in enhancing NMR sensitivity.
  • To demonstrate the utility of the duplexer in a cryocoil magic-angle spinning (MAS) probe.

Main Methods:

  • Development of a cryogenic duplexer utilizing Gallium Arsenide (GaAs) diodes and radiofrequency (rf) microelectrical mechanical systems (MEMS) switches.
  • Integration of the cryogenic duplexer into a cryocoil MAS probe.
  • Measurement of rf pulse leakage through the duplexer.
  • Assessment of signal-to-noise ratio (SNR) gain in proton (1H) MAS-NMR experiments at reduced temperatures.

Main Results:

  • The developed cryogenic duplexer operates effectively below 50 K.
  • Observed rf pulse leakage through the duplexer is below 1 mW for a 100 W, 50 μs pulse, indicating low signal loss.
  • Integration with a commercial rf preamplifier in a cryocoil MAS probe achieved a 4.0 times SNR gain for 1H MAS-NMR.
  • This gain was realized by lowering the detection coil temperature to 12 K and the rf preamplifier and duplexer temperatures to 43 K.

Conclusions:

  • The cryogenic duplexer is suitable for both liquid and solid-state NMR due to its low rf leakage.
  • The developed technology significantly enhances NMR sensitivity, particularly for 1H MAS-NMR.
  • This advancement opens possibilities for more sensitive NMR investigations at low temperatures.