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Resonant Auger scattering (RAS) reveals electronic structure dynamics. This study uses X-ray pulses to track molecular distortions and ultrafast dissociation in real-time.

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Area of Science:

  • Physical Chemistry
  • Atomic and Molecular Physics
  • Ultrafast Spectroscopy

Background:

  • Resonant Auger scattering (RAS) probes core-valence electronic transitions, offering insights into molecular electronic structure and nuclear configuration.
  • Understanding ultrafast molecular dynamics, such as dissociation, requires advanced spectroscopic techniques capable of time-resolved measurements.

Purpose of the Study:

  • To develop and demonstrate a novel pump-probe technique utilizing femtosecond X-ray pulses to trigger and probe Resonant Auger scattering (RAS) in molecules undergoing nuclear evolution.
  • To map the electronic structures and changing geometries of molecules during ultrafast processes like dissociation.

Main Methods:

  • Employing a femtosecond ultraviolet pulse to excite molecules to a valence excited state, initiating nuclear evolution.
  • Using a time-delayed femtosecond X-ray pulse to trigger RAS, probing the electronic structure and geometry at controlled time delays.
  • Analyzing RAS spectra for molecular and fragment lines as signatures of dissociation dynamics.

Main Results:

  • Demonstrated the ability to control the extent of molecular distortion by varying the time delay between pump and probe pulses.
  • Observed distinct molecular and fragment lines in RAS spectra of water (H2O) dissociating from an O-H bond excited state, confirming ultrafast dissociation.
  • Showcased the sensitivity of RAS to both electronic structure and geometric changes during molecular evolution.

Conclusions:

  • The proposed X-ray pump-probe RAS technique provides a powerful new method for investigating core and valence electron dynamics in molecules.
  • This approach offers a versatile platform for studying ultrafast chemical processes, including bond dissociation and geometric rearrangements, in a wide range of molecular systems.
  • Opens new avenues for real-time mapping of electronic and nuclear dynamics with high temporal resolution.