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Related Experiment Video

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Direct Imaging of Laser-driven Ultrafast Molecular Rotation

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Large-angle electron diffraction structure in laser-induced rescattering from rare gases.

D Ray¹, B Ulrich, I Bocharova

¹JR Macdonald Laboratory, Physics Department, Kansas State University, Manhattan, Kansas 66506-2601, USA.

Physical Review Letters

|June 4, 2008

Summary

High-intensity laser pulses liberate electrons from noble gases, creating diffraction patterns. These patterns depend on the target atom and match electron scattering calculations from ionic cores.

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Area of Science:

Atomic, Molecular, and Optical Physics
Quantum Mechanics
Laser-Matter Interactions

Background:

Understanding electron-atom interactions is crucial in fields like attosecond science and plasma physics.
Short, intense laser pulses provide a unique tool to probe atomic and molecular dynamics.
Electron rescattering is a key mechanism in strong-field physics, influencing phenomena like high-harmonic generation.

Purpose of the Study:

To investigate the angular structure of rescattered electrons from noble gas atoms (Xenon, Krypton, Argon).
To determine the target dependence of electron diffraction patterns.
To compare experimental results with theoretical calculations of electron scattering from ionic cores.

Main Methods:

Utilizing short, intense laser pulses to ionize noble gas atoms.
Measuring full momentum images of liberated and rescattered electrons.
Analyzing the angular distribution of electrons at high momenta.

Main Results:

Observed distinct angular structures (diffraction patterns) in the high-momentum electron spectra.
Demonstrated significant target dependence of these diffraction patterns for Xe, Kr, and Ar.
Found excellent agreement between experimental data and calculated differential cross sections for free electron scattering from corresponding ionic cores.

Conclusions:

Electron rescattering from noble gas atoms exhibits target-specific diffraction features.
The observed diffraction patterns are primarily governed by the interaction of the electron with the atomic ionic core.
This study validates theoretical models of electron-ion scattering in the context of intense laser-atom interactions.