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Massively parallel ionization of extended atomic systems.

Christian Gnodtke¹, Ulf Saalmann, Jan-Michael Rost

¹Max Planck Institute for the Physics of Complex Systems, Dresden, Germany.

Physical Review Letters

|June 12, 2012

Summary

Intense, short laser pulses cause massively parallel ionization in atoms and molecules. This light-matter interaction creates a unique electron spectrum resulting from electron-electron collisions, observable in hydrogen clusters.

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Area of Science:

Atomic and Molecular Physics
Quantum Optics
Plasma Physics

Background:

Intense ultrashort laser pulses enable novel light-matter interactions.
Photoionization of clusters and biomolecules can lead to dense electron clouds.

Purpose of the Study:

To identify and characterize massively parallel ionization as a new light-matter interaction phenomenon.
To explain the resulting electron spectrum through theoretical modeling.
To propose an experimental verification.

Main Methods:

Theoretical analysis of electron-electron interactions post-photoionization.
Analytical derivation of the electron spectrum using summed two-body Coulomb collision events.
Proposal for an experiment utilizing hydrogen clusters.

Main Results:

Massively parallel ionization is identified as a new light-matter interaction.
The characteristic electron spectrum is explained as a convolution of mean-field dynamics and binary electron-electron collisions.
An analytical method for obtaining the universal spectrum was demonstrated.

Conclusions:

The observed electron spectrum provides evidence for significant post-photoionization electron interactions.
The proposed analytical model accurately describes the electron spectrum.
Experimental observation of massively parallel ionization in hydrogen clusters is feasible and recommended.