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Electric Field of Two Equal and Opposite Charges01:30

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Atoms generally contain the same number of positively and negatively charged particles, protons, and electrons. Hence, they are electrically neutral. However, the centers of the positive and negative charges do not always coincide. In such a scenario, the electric field of an atom may not be zero.
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Electrons revolving around a nucleus are analogous to a circular current carrying loop. This current produces a magnetic dipole moment proportional to the electron's orbital angular momentum. Since the orbital angular momentum is quantized in terms of the reduced Planck's constant, the dipole moment is quantized in the Bohr Magneton. The value of the Bohr magneton is 9.27 x 10-24 Am2. Electrons also have an intrinsic spin angular momentum, and the associated spin magnetic moment is...
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High-field quantum calculation reveals time-dependent negative Kerr contribution.

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Area of Science:

  • Quantum optics
  • Atomic physics
  • Strong-field physics

Background:

  • The perturbative model is widely used for atomic polarization under intense laser fields.
  • Understanding quantum optical response is crucial for strong-field physics.

Purpose of the Study:

  • Investigate the exact quantum time-dependent optical response of hydrogen under strong-field near-infrared excitation.
  • Compare findings with the perturbative model.
  • Identify contributions missing in weak-field models.

Main Methods:

  • Solving the full 3D time-dependent Schrödinger equation.
  • Analyzing quantum time-dependent optical response.
  • Comparing exact solutions with perturbative models.

Main Results:

  • A supplementary, quasi-instantaneous defocusing contribution was identified.
  • This effect is significant, especially during ionization channel closures.
  • The effect originates from electron-parent ion interactions.

Conclusions:

  • The identified defocusing effect is missing in weak-field polarization models.
  • This provides an interpretation for the higher-order Kerr effect observed in gases.
  • Accurate modeling of strong-field interactions requires accounting for these effects.