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Double Resonance Techniques: Overview

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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.
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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...

Atomic Nuclei: Magnetic Resonance

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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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Related Experiment Video

Updated: Jul 3, 2026

Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis

Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis

Published on: March 29, 2016

Noise-resilient multi-frequency surface sensor for nuclear quadrupole resonance.

A S Peshkovsky¹, C J Cattena, L M Cerioni

¹RF Sensors, LLC, New York, NY 10033, USA. alexey@rf-sensors.com

Journal of Magnetic Resonance (San Diego, Calif. : 1997)

|August 1, 2008

Summary

A novel planar nuclear quadrupole resonance (NQR) sensor effectively cancels environmental noise using destructive interference. This allows for simultaneous, multi-frequency detection of substances, even in noisy environments.

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Fabrication and Characterization of Superconducting Resonators

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Last Updated: Jul 3, 2026

Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis

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Published on: March 29, 2016

$Studying Soft-matter and Biological Systems over a Wide Length-scale from Nanometer and Micrometer Sizes at the Small-angle Neutron Diffractometer KWS-2$

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Fabrication and Characterization of Superconducting Resonators

Fabrication and Characterization of Superconducting Resonators

Published on: May 21, 2016

Area of Science:

Physics
Chemistry
Materials Science

Background:

Nuclear Quadrupole Resonance (NQR) spectroscopy is a sensitive technique for material analysis.
Traditional NQR sensors can be susceptible to environmental noise, limiting their application.
Existing sensors often lack multi-frequency or simultaneous detection capabilities.

Purpose of the Study:

To develop a novel planar NQR sensor with enhanced resilience to environmental noise.
To enable simultaneous and independent multi-frequency operation for NQR detection.
To utilize higher, typically unused modes of a birdcage structure for improved NQR signal detection.

Main Methods:

Construction of an open multimodal birdcage structure for the NQR sensor.
Utilization of higher resonant modes with smooth amplitude and cyclically shifted phase distributions.
Exploitation of destructive interference for noise cancellation and phase-insensitive NQR signal detection.

Main Results:

The developed planar NQR sensor demonstrates resilience to environmental noise through destructive interference.
The sensor achieves simultaneous and independent multi-frequency operation.
Efficient detection of NQR signals from polycrystalline or disordered substances is achieved without blind spots.

Conclusions:

The novel planar NQR sensor overcomes limitations of existing technologies by effectively mitigating environmental noise.
The sensor's design enables simultaneous detection of multiple substances in challenging environments.
This advancement opens new possibilities for NQR applications in material analysis and detection.