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Related Concept Videos

Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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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.
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Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

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All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
996
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

901
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
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Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

596
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 Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

821
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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Diamagnetism01:26

Diamagnetism

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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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Cold source of atomic hydrogen for loading large magnetic traps.

Aleksei Semakin1, Janne Ahokas1, Otto Hanski1

  • 1Department of Physics and Astronomy, University of Turku, 20014 Turku, Finland.

The European Physical Journal. D, Atomic, Molecular, and Optical Physics
|March 31, 2025
PubMed
Summary
This summary is machine-generated.

We developed a new cold hydrogen atom source for magnetic traps, achieving high atom flux at millikelvin temperatures. This source enables precise spectroscopy experiments with cold hydrogen gas.

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Area of Science:

  • Atomic Physics
  • Cryogenics
  • Quantum Gases

Background:

  • Loading magnetic traps with cold atoms is crucial for precision measurements.
  • Existing sources often lack sufficient flux or require higher temperatures.
  • Cold hydrogen atoms are ideal for fundamental physics studies.

Purpose of the Study:

  • To design and test an intense source of cold hydrogen atoms for loading large magnetic traps.
  • To achieve continuous flux of hydrogen atoms at millikelvin temperatures.
  • To enable precision spectroscopy experiments with cold hydrogen gas.

Main Methods:

  • A cryogenic dissociator of molecular hydrogen at 0.6 K.
  • Thermal accommodators utilizing a superfluid helium film at 0.5, 0.2, and 0.13 K.
  • Anchoring components to a dilution refrigerator for precise temperature control.

Main Results:

  • Continuous flux of 10^17 H atoms/s achieved in the 130-200 mK temperature range.
  • Successful loading of a large Ioffe-Pritchard magnetic trap.
  • Storage of cold hydrogen gas at densities >10^14 cm^-3 for over 1000 s.

Conclusions:

  • The developed source provides an intense, continuous flux of cold hydrogen atoms.
  • The source is effective for loading large magnetic traps and enabling precision spectroscopy.
  • The system demonstrates reliable performance at millikelvin temperatures.