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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

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Double ionization in a one-cycle laser pulse.

|April 30, 2009

Summary

A study on intense laser pulses and helium atoms reveals that full-cycle pulses cause double ionization, linked to electron return times. Truncating electron excursions or altering the field during return affects this ionization process.

Area of Science:

Quantum mechanics
Atomic physics
Strong-field laser-matter interactions

Background:

Understanding electron behavior in atoms under intense laser fields is crucial for fields like attosecond science.
Previous studies explored single ionization, but double ionization dynamics require further investigation.

Purpose of the Study:

To investigate the time-dependent Schrodinger equation for a two-electron helium atom model.
To analyze the effects of low-frequency, intense laser pulses on single and double ionization.
To determine the relationship between electron trajectories and double ionization events.

Main Methods:

Numerical solution of the time-dependent Schrodinger equation for a 1D x 1D two-electron helium atom model.
Simulation of interactions with half-cycle and full-cycle laser pulses.

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Analysis of electron ejection times and trajectories.

Main Results:

Half-cycle pulses resulted in strong single ionization but no double ionization.
Full-cycle pulses induced double ionization, initiating precisely at the classical return time of the first ejected electron.
Truncating the first electron's excursion range eliminated later double ionization events.
Double ionization persisted even when the field near the nucleus was temporarily turned off during the first electron's return.

Conclusions:

The return time of the first ejected electron is a critical factor for double ionization in this model.
Electron trajectory and excursion range significantly influence the probability of double ionization.
The findings provide insights into the complex dynamics of multi-electron ionization under intense laser fields.