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Related Experiment Videos

Electron solvation dynamics in I-(NH3)n clusters

Frischkorn1, Zanni, Davis

  • 1Department of Chemistry, University of California, Berkeley 94720, USA.

Faraday Discussions
|October 21, 2000
PubMed
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Femtosecond photoelectron spectroscopy reveals electron solvation dynamics in iodide-ammonia clusters. Solvation and electron emission lifetimes increase gradually with cluster size.

Area of Science:

  • Physical Chemistry
  • Chemical Physics
  • Spectroscopy

Background:

  • Investigating electron dynamics in clusters is crucial for understanding solvation processes.
  • Charge-transfer-to-solvent (CTTS) states are key intermediates in photoinduced electron transfer reactions.

Purpose of the Study:

  • To monitor the dynamics of CTTS precursor states in iodide-ammonia (I-(NH3)n) clusters using femtosecond photoelectron spectroscopy (FPES).
  • To elucidate the size-dependent solvation and decay mechanisms of excited states in these clusters.

Main Methods:

  • Femtosecond photoelectron spectroscopy (FPES) was employed to probe ultrafast dynamics.
  • Experiments were conducted on I-(NH3)n clusters with n ranging from 4 to 15.

Main Results:

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  • The FPE spectra indicate partial electron solvation on a 0.5–2 ps timescale due to solvent rearrangement.
  • The partially solvated state decays via electron emission on a 10–50 ps timescale.
  • Both solvation extent and lifetimes show a gradual increase with increasing cluster size (n).

Conclusions:

  • The solvation dynamics in I-(NH3)n clusters differ from those in I-(H2O)n clusters, exhibiting more gradual size-dependent effects.
  • These findings provide insights into the fundamental processes of electron solvation and charge transfer in mixed ammonia-iodide systems.