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We studied ultrafast electronic relaxation in sodium iodide (NaI) solutions using UV laser pulses. The charge-transfer-to-solvent (CTTS) states show rapid population and relaxation dynamics, offering insights into hydration cage responses.

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Area of Science:

  • Physical Chemistry
  • Femtochemistry
  • Spectroscopy

Background:

  • Understanding electronic relaxation dynamics in solution is crucial for chemical reactions.
  • Charge-transfer-to-solvent (CTTS) states play a key role in photoinduced processes in ionic solutions.
  • Previous studies often used resonant excitation, limiting insights into non-resonant pathways.

Purpose of the Study:

  • To investigate the early-time electronic relaxation dynamics of CTTS states in NaI aqueous solution.
  • To populate CTTS states via non-resonant electronic excitation above the vacuum level.
  • To compare relaxation dynamics initiated by non-resonant versus resonant excitation.

Main Methods:

  • Time-resolved photoelectron spectroscopy was employed to probe ultrafast dynamics.
  • Transient species, including CTTS and its excited state, were monitored via electron yields.
  • Analysis focused on the temporal evolution of electron signals following UV laser excitation.

Main Results:

  • Ultrafast population dynamics of CTTS and its first excited state were determined.
  • Relaxation dynamics were observed on femtosecond timescales.
  • Non-resonant excitation revealed similar relaxation characteristics to resonant excitation pathways.

Conclusions:

  • The study elucidates the ultrafast relaxation mechanisms of CTTS states initiated by non-resonant excitation.
  • Findings provide insights into the structural and dynamical response of the hydration cage surrounding ions.
  • The results contribute to a deeper understanding of photoinduced electron transfer processes in aqueous solutions.