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Ultrafast hard x-ray scattering observed valence electron rearrangement in photoexcited ammonia. This technique tracks electronic structure changes during molecular dissociation, advancing chemical dynamics research.

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Area of Science:

  • Chemical Physics
  • Molecular Dynamics
  • X-ray Scattering

Background:

  • Time-resolved x-ray scattering typically relies on core electron signals.
  • Valence electron dynamics are often masked by dominant core electron scattering.
  • Ammonia's unique core-to-valence electron ratio allows valence electron observation.

Purpose of the Study:

  • To observe valence electron rearrangement in photoexcited ammonia.
  • To utilize ultrafast hard x-ray scattering for imaging electronic structure dynamics.
  • To investigate dissociation pathways in photoexcited ammonia.

Main Methods:

  • Ultrafast hard x-ray scattering (9.8 keV) on gas-phase deuterated ammonia.
  • Photoexcitation using a 200 nm pump pulse to the 3s Rydberg state.
  • Ab initio calculations to interpret scattering data and dissociation dynamics.

Main Results:

  • Observed scattering pattern changes indicating valence electron rearrangement.
  • Detected signatures of initial photoexcitation and subsequent deuterium dissociation.
  • Confirmed sensitivity of the signal to electron rearrangement and dissociation channels.

Conclusions:

  • Ultrafast hard x-ray scattering can image valence electron rearrangement.
  • This method advances the study of electronic structure in photoexcited molecules.
  • The technique provides insights into adiabatic and nonadiabatic dissociation mechanisms.