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Revealing Molecular Strong Field Autoionization Dynamics.

Sizuo Luo1, Jinlei Liu2, Xiaokai Li1

  • 1Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China.

Physical Review Letters
|March 30, 2021
PubMed
Summary
This summary is machine-generated.

We identified novel strong field autoionization (SFAI) dynamics in CO molecules. This research reveals how laser fields control electron emission and molecular autoionization, offering new quantum control pathways.

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Area of Science:

  • Quantum dynamics
  • Strong field physics
  • Molecular spectroscopy

Background:

  • Autoionization is a fundamental quantum process where an excited atom or molecule spontaneously emits an electron.
  • Strong laser fields can significantly alter atomic and molecular processes, including autoionization dynamics.
  • Understanding electron correlation and electron-nuclear coupling is crucial in molecular physics.

Purpose of the Study:

  • To identify and investigate novel strong field autoionization (SFAI) dynamics in a double-ionized CO molecule.
  • To elucidate the mechanisms of electron generation and emission in SFAI.
  • To explore the influence of strong laser fields on autoionizing states and electron dynamics.

Main Methods:

  • Channel-resolved angular streaking measurements were employed to study the dynamics of two electrons and two ions in double-ionized CO.
  • Comparison with laser-assisted autoionization calculations was performed to understand the electron generation process.
  • Analysis of energy-dependent photoelectron angular distributions was used to probe the role of the ac-Stark effect.

Main Results:

  • A novel strong field autoionization (SFAI) mechanism was identified in double-ionized CO.
  • Electrons in SFAI are generated via field-induced decay of autoionizing states, followed by acceleration in laser fields.
  • The subcycle ac-Stark effect was shown to modulate the autoionizing state lifetime and control SFAI electron emission in the molecular frame.

Conclusions:

  • The findings provide insights into controlling resonant high-harmonic generation and tracing electron-electron correlation and electron-nuclear coupling using strong laser fields.
  • Modulating the lifetime of quantum systems in strong laser fields presents significant potential for quantum manipulation of chemical reactions.
  • This work opens new avenues for controlling quantum dynamics in molecules with tailored laser fields.