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Ultrafast Imaging of Molecules with Electron Diffraction.

Martin Centurion1, Thomas J A Wolf2, Jie Yang3

  • 1Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska, USA;

Annual Review of Physical Chemistry
|November 1, 2021
PubMed
Summary

Gas phase ultrafast electron diffraction (GUED) reveals molecular structural dynamics on femtosecond timescales. This technique probes nuclear geometry evolution, complementing electronic state spectroscopy for a comprehensive understanding of light-driven molecular transformations.

Keywords:
femtosecond dynamicsmolecular dynamicsmolecular imagingstructural dynamicsultrafast electron diffraction

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Area of Science:

  • Chemical Physics
  • Molecular Dynamics
  • Ultrafast Spectroscopy

Background:

  • Photoexcited molecules convert light energy into chemical and mechanical energy via ultrafast electronic and nuclear structural changes.
  • Spectroscopic methods primarily detect electronic states, necessitating complementary techniques for nuclear dynamics.

Purpose of the Study:

  • To present the fundamental theory of Gas Phase Ultrafast Electron Diffraction (GUED).
  • To elucidate the information contained within the GUED signal.
  • To review recent experimental observations of coherent structural dynamics using GUED and discuss its capabilities.

Main Methods:

  • Utilizing ultrafast electron diffraction (UED) in the gas phase to probe molecular structure.
  • Achieving femtosecond temporal resolution and sub-angstrom spatial resolution.
  • Employing a weak and passive probing tool that does not perturb molecular properties.

Main Results:

  • Demonstrated GUED's capability to capture coherent nuclear motions in both excited and ground electronic states.
  • Provided insights into the evolution of molecular geometry on ultrafast timescales.
  • Illustrated the sensitivity of GUED to the spatial distribution of charge within molecules.

Conclusions:

  • GUED is an ideal tool for investigating nuclear geometry evolution in photoexcited molecules.
  • The method complements spectroscopic techniques by providing direct structural information.
  • Advancements in temporal resolution enhance GUED's utility for studying ultrafast molecular dynamics.