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Related Concept Videos

π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
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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: Magnetic Resonance01:05

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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Atomic Nuclei: Nuclear Spin State Population Distribution01:14

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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: 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...
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Magnetic-Field Effect in High-Order Above-Threshold Ionization.

Kang Lin1,2, Simon Brennecke3, Hongcheng Ni2,4,5

  • 1Institut für Kernphysik, Goethe-Universität Frankfurt am Main, Frankfurt am Main 60438, Germany.

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This summary is machine-generated.

Investigating the magnetic field

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Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Quantum Electrodynamics
  • Strong Field Physics

Background:

  • High-order above-threshold ionization (ATI) is a fundamental process in strong field physics.
  • Understanding electron behavior in intense laser fields is crucial for attosecond science and high-harmonic generation.
  • The influence of the magnetic component of electromagnetic fields on ATI is less explored than the electric component.

Purpose of the Study:

  • To experimentally and theoretically investigate the magnetic field's influence on high-order ATI of xenon atoms.
  • To analyze the nondipole shift in electron momentum distribution, particularly beyond the classical cutoff.
  • To identify novel structures in electron momentum distributions and understand their origins.

Main Methods:

  • Experimental measurements using ultrashort femtosecond laser pulses on xenon atoms.
  • Theoretical investigations employing classical and quantum-orbit analysis.
  • Three-dimensional time-dependent Schrödinger equation (3D TDSE) simulations with various model potentials.

Main Results:

  • The nondipole shift of electron momentum distribution differs significantly below and above the 2U_{p} cutoff.
  • A novel local minimum in the momentum dependence of the nondipole shift above the cutoff was identified.
  • Large-angle electron rescattering was shown to significantly alter photon momentum partitioning between electron and ion.
  • Simulations confirmed the sensitivity of the nondipole shift to the target atom's electronic structure.

Conclusions:

  • The magnetic field component plays a critical role in shaping high-order ATI dynamics, especially at high electron energies.
  • The identified nondipole shift structures provide new insights into electron-ion momentum partitioning in strong laser fields.
  • This research advances the understanding of extreme light-matter interactions at long wavelengths and high electron kinetic energies.