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A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
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Updated: Nov 16, 2025

Electrochemical Etching and Characterization of Sharp Field Emission Points for Electron Impact Ionization
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Electric Nondipole Effect in Strong-Field Ionization.

A Hartung1, S Brennecke2, K Lin1,3

  • 1Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany.

Physical Review Letters
|February 19, 2021
PubMed
Summary
This summary is machine-generated.

Strong-field ionization reveals a new electric nondipole effect, distinct from magnetic effects. This electric effect alters electron momentum distributions, showing unique radius changes based on electron direction.

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Area of Science:

  • Atomic Physics
  • Quantum Mechanics
  • Strong-Field Physics

Background:

  • Strong-field ionization using circularly polarized laser pulses generates donut-shaped electron momentum distributions.
  • The dipole approximation predicts symmetry in these distributions relative to the polarization plane.
  • The magnetic component of the light field causes a known forward shift in electron momentum distributions.

Purpose of the Study:

  • To identify and characterize nondipole effects beyond the magnetic component in strong-field ionization.
  • To investigate the role of the electric field's position dependence in atomic ionization.
  • To present experimental evidence and theoretical comparisons of a novel electric nondipole effect.

Main Methods:

  • Experimental strong-field ionization using circularly polarized femtosecond laser pulses.
  • Analysis of electron momentum distributions.
  • Comparison with classical models and quantum calculations.

Main Results:

  • An electric nondipole effect, analogous to the Doppler effect, was identified.
  • This electric effect causes an increase in the electron momentum distribution's radius for forward-directed electrons and a decrease for backward-directed electrons.
  • Experimental data confirmed the predicted "fingerprint" of the electric nondipole effect.

Conclusions:

  • The electric nondipole effect is a significant factor in strong-field ionization, complementing the magnetic nondipole effect.
  • Understanding these nondipole effects is crucial for accurately describing electron dynamics in intense laser fields.
  • The findings necessitate revisions to models that solely rely on the dipole approximation.