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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

282
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...
282
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

1.1K
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...
1.1K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

1.1K
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
1.1K
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

711
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
711
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

745
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...
745
Alkali Metals03:06

Alkali Metals

19.8K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
19.8K

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Updated: Sep 3, 2025

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A digital alkali spin maser.

Stuart Ingleby1, Paul Griffin2, Terry Dyer2

  • 1Department of Physics, SUPA, Strathclyde University, 107 Rottenrow East, Glasgow, G4 0NG, Lanarkshire, UK. stuart.ingleby@strath.ac.uk.

Scientific Reports
|July 28, 2022
PubMed
Summary
This summary is machine-generated.

We developed a self-oscillating atomic magnetometer using digital signal processing for high sensitivity. This portable geophysical magnetic field sensor achieves 50 fT resolution, enabling precise measurements.

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Area of Science:

  • Atomic physics
  • Quantum sensing
  • Geophysical instrumentation

Background:

  • Self-oscillating atomic magnetometers utilize resonant modulation of atomic spin precession for high sensitivity and dynamic range.
  • Phase-coherent feedback in spin maser systems enhances responsiveness to background magnetic fields.

Purpose of the Study:

  • To demonstrate a novel self-oscillating atomic magnetometer integrating digital signal processing into the feedback loop.
  • To develop a portable and highly sensitive sensor for geophysical magnetic field measurements.

Main Methods:

  • Implementation of digital signal processing to meet the phase condition for resonant precession within a spin maser.
  • Utilizing a chip-scale laser and a mass-produced dual-pass caesium vapor cell.
  • Operation in a 50 µT background magnetic field.

Main Results:

  • Achieved a Cramér-Rao lower bound-limited resolution of 50 fT at a 1 s sampling cadence.
  • Demonstrated a sensor bandwidth of 10 kHz.
  • Showcased the integration of low-latency digital processing within a coherently-driven quantum system.

Conclusions:

  • The developed atomic magnetometer is suitable for portable geophysical magnetic field measurements.
  • This work represents a significant advancement in atomic systems where digital processing is integral to quantum coherently-driven systems.