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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

293
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...
293
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
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Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

753
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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Atomic Nuclei: Nuclear Spin01:08

Atomic Nuclei: Nuclear Spin

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All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not...
2.7K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.1K
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...
1.1K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

1.6K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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Updated: Sep 11, 2025

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Double Spin Resonance for Traceable Ultrasensitive Atomic Spin Sensor.

Xiaofei Huang1, Weiyi Wang1, Yanhui Hu2

  • 1Beihang University, The School of Instrumentation and Optoelectronic Engineering, Beijing 100191, China.

Physical Review Letters
|August 12, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed an ultrasensitive atomic spin sensor using double spin resonance, achieving 0.57 fT/√Hz sensitivity. This breakthrough enhances traceability for quantum metrology and new physics exploration.

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Area of Science:

  • Quantum Physics
  • Atomic Physics
  • Metrology

Background:

  • Atomic spin sensors are crucial for precise measurements.
  • Existing sensors face limitations in sensitivity and traceability in magnetic fields.

Purpose of the Study:

  • To develop an ultrasensitive atomic spin sensor with enhanced traceability.
  • To improve the accuracy of measurements in complex environments.

Main Methods:

  • Utilizing double spin resonance for signal enhancement.
  • Employing in situ alkali-noble-gas spin sensing.
  • Implementing pulsed train sequences to suppress systematic uncertainties.

Main Results:

  • Achieved a spin signal enhancement of 2600.
  • Reached an unprecedented sensitivity of 0.57 fT/√Hz under nonzero magnetic fields.
  • Suppressed Fermi-contact interaction uncertainties by over 2 orders of magnitude.

Conclusions:

  • The developed sensor offers ultrahigh sensitivity and traceability.
  • Opens new avenues for exploring physics beyond the standard model.
  • Advances quantum metrology applications in challenging environments.