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Related Concept Videos

Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession, and the angular frequency...
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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. This...
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Mass Analyzers: Common Types

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

Atomic Nuclei: Nuclear Spin State Overview

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 one, the...
Nuclear Transmutation03:20

Nuclear Transmutation

Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed protons being...

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Activating Molecules, Ions, and Solid Particles with Acoustic Cavitation
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Quadrupolar waves in uranium dioxide.

S Carretta1, P Santini, R Caciuffo

  • 1Dipartimento di Fisica, Università di Parma, and Unità CNISM di Parma, Viale G. P. Usberti 7/A, I-43100 Parma, Italy.

Physical Review Letters
|January 15, 2011
PubMed
Summary
This summary is machine-generated.

Researchers identified quadrupolar waves, a type of exotic excitation, in uranium dioxide. These waves explain previously unexplained features in experimental data, advancing our understanding of magnetic materials.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Quantum magnetism

Background:

  • Elementary excitations in broken-symmetry states with active orbital degrees of freedom can involve multipolar waves.
  • Identifying these exotic dispersive excitation branches has remained a challenge in condensed matter physics.

Purpose of the Study:

  • To identify and characterize quadrupolar waves as a component of elementary excitations.
  • To explain unexplained features in inelastic neutron scattering data of uranium dioxide.

Main Methods:

  • Theoretical modeling of elementary excitations in uranium dioxide.
  • Analysis of existing inelastic neutron scattering data.

Main Results:

  • Quadrupolar waves are a significant factor in the dynamics of uranium dioxide's magnetoquadrupolar ordered phase.
  • A previously unidentified excitation branch in experimental data is attributed to propagating quadrupolar fluctuations.
  • The model distinguishes the contributions of Jahn-Teller and superexchange mechanisms to quadrupolar interactions.

Conclusions:

  • Quadrupolar waves are experimentally observable excitations in magnetic materials.
  • This finding resolves long-standing mysteries in inelastic neutron scattering data for uranium dioxide.
  • The study provides a framework for understanding the origins of quadrupolar interactions.