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Imaging electron-density fluctuations by multidimensional X-ray photon-coincidence diffraction.

Lyuzhou Ye1, Jérémy R Rouxel2,3, Daeheum Cho4

  • 1Department of Chemistry, University of California, Irvine, CA 92697; smukamel@uci.edu lyuzhouy@uci.edu.

Proceedings of the National Academy of Sciences of the United States of America
|December 26, 2018
PubMed
Summary
This summary is machine-generated.

This study uses X-ray diffraction to visualize ultrafast electron density fluctuations in molecules. The technique captures evolving electron density snapshots, offering new insights into molecular dynamics.

Keywords:
X-ray diffractionmultidimensional spectroscopyphoton-coincidence

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Area of Science:

  • Theoretical chemistry
  • Molecular dynamics
  • Quantum mechanics

Background:

  • Understanding electron density dynamics is crucial for molecular processes.
  • Ultrafast phenomena require advanced probing techniques.
  • X-ray diffraction offers high temporal and spatial resolution.

Purpose of the Study:

  • To theoretically investigate ultrafast spontaneous electron-density fluctuation dynamics in molecules.
  • To develop a novel method using off-resonant multiple X-ray diffraction.
  • To visualize electron density evolution at ultrafast timescales.

Main Methods:

  • Theoretical modeling of off-resonant multiple X-ray diffraction.
  • Analysis of time- and wavevector-resolved photon-coincidence signals.
  • Utilizing four-point correlation functions in momentum space.
  • Fourier transform to obtain real-space correlation functions.
  • Ab initio simulations for validation.

Main Results:

  • The technique provides time- and wavevector-resolved images of electron-density fluctuations.
  • Four-point correlation functions reveal momentum-space charge density dynamics.
  • Real-space correlation functions offer snapshots of evolving electron density.
  • Simulations demonstrate the method's applicability to cyanotetracetylene.

Conclusions:

  • The proposed X-ray diffraction technique can image ultrafast electron density dynamics.
  • This method provides unprecedented insight into molecular electronic behavior.
  • The findings pave the way for experimental validation and further studies.