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Chaotic versus random ionization.

A López-Castillo1, C R de Oliveira

  • 1Departamento de Matemática-UFSCar, São Carlos, SP, 13560-970, Brazil.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|April 20, 2001
PubMed
Summary

We compare electric field-driven hydrogen atom ionization rates from chaotic and random electric field amplitudes. Random fields are more effective for weak fields, while chaotic fields dominate for strong fields, showing a crossover in ionization behavior.

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Area of Science:

  • Atomic Physics
  • Quantum Mechanics
  • Plasma Physics

Background:

  • Classical ionization of hydrogen atoms by electric fields is a fundamental process.
  • Understanding ionization mechanisms is crucial for various physical phenomena.

Purpose of the Study:

  • To compare the ionization rate (IR) of hydrogen atoms driven by chaotic electric fields versus random electric fields.
  • To investigate the crossover in ionization effectiveness between chaotic and random field amplitudes.

Main Methods:

  • Utilizing Kepler maps to analyze the classical ionization of hydrogen atoms.
  • Comparing ionization rates under constant (chaotic) and random electric field amplitudes.

Main Results:

  • For weak electric fields, random field amplitude leads to more effective ionization.
  • For strong electric fields, chaotic field amplitude is more effective, resulting in a crossover of ionization curves.
  • A physical explanation based on trajectory behavior is provided.

Conclusions:

  • The effectiveness of ionization depends on the electric field strength and the nature of its amplitude variation (chaotic vs. random).
  • Trajectory analysis reveals the underlying physical mechanisms driving the observed crossover phenomenon.

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