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Multiple ionization bursts in laser-driven hydrogen molecular ion.

Norio Takemoto1, Andreas Becker

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Summary
This summary is machine-generated.

Hydrogen molecular ions (H2(+)) exhibit multiple ionization bursts under intense infrared laser fields. This phenomenon, observed on the attosecond timescale, differs from atomic tunnel ionization and involves electron localization.

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Area of Science:

  • Quantum mechanics
  • Strong-field physics
  • Molecular dynamics

Background:

  • Atomic tunnel ionization is a well-established phenomenon.
  • Understanding molecular ionization dynamics is crucial for attosecond science.
  • H2(+) serves as a fundamental model system for molecular behavior.

Purpose of the Study:

  • To theoretically investigate the ionization dynamics of H2(+) in intense infrared laser fields.
  • To explore electron behavior on the attosecond timescale.
  • To contrast molecular ionization with atomic tunnel ionization.

Main Methods:

  • Theoretical modeling of H2(+) in an intense infrared laser field.
  • Attosecond time-scale simulations.
  • Analysis of electron localization and ionization bursts.

Main Results:

  • H2(+) shows multiple ionization bursts within a single laser field half-cycle.
  • Ionization bursts are linked to transient electron localization at one nucleus.
  • A relationship between localization time and laser vector potential was derived.

Conclusions:

  • The ionization mechanism for H2(+) differs significantly from atomic tunnel ionization.
  • Electron localization dynamics can be probed using extreme ultraviolet laser pulses.
  • This study offers new insights into light-induced molecular processes.