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Direct Imaging of Laser-driven Ultrafast Molecular Rotation

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¹Department of Chemistry, Wayne State University, Detroit, Michigan 48202, USA.

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|January 31, 2012

Summary

This summary is machine-generated.

Investigating above threshold ionization (ATI) in molecules like N(2), O(2), and CO(2) reveals that electron-rescattering dynamics obscure structural information. Photoelectron angular distributions (PAD) show species and energy dependence, limiting direct structural retrieval.

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Area of Science:

Atomic and Molecular Physics
Quantum Optics
Chemical Physics

Background:

Above Threshold Ionization (ATI) is a fundamental process in strong-field physics.
Understanding molecular structure through electron scattering is crucial for chemical dynamics.
Photoelectron Angular Distributions (PAD) offer insights into ionization dynamics.

Purpose of the Study:

To measure and analyze photoelectron spectra and angular distributions in partially aligned N(2), O(2), and CO(2) molecules.
To investigate the species and energy dependence of ATI electron angular distributions.
To assess the feasibility of extracting molecular structural information from ATI.

Main Methods:

Experimental measurement of photoelectron spectra and angular distributions.
Utilizing partially aligned molecules (N(2), O(2), CO(2)) in the rescattering plateau of ATI.
Analysis of low-energy (<15 eV) ATI electrons.

Main Results:

Photoelectron angular distributions (PAD) exhibited clear species and energy dependence.
A simple two-center interference model failed to consistently retrieve molecular structural properties.
Molecular structural information was found to be obscured by electron-rescattering dynamics.

Conclusions:

Direct extraction of molecular structural information from ATI is challenging due to complex electron-rescattering interactions.
The sensitivity of PAD to scattering potentials suggests potential for studying electron-ion dynamics.
Laser-induced electron diffraction shows promise for probing electron-ion scattering dynamics.