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Ultrafast hot-electron dynamics observed in Pt( -)(3) using time-resolved photoelectron spectroscopy

Pontius1, Bechthold, Neeb

  • 1Institut fur Festkorperforschung, Forschungszentrum Julich GmbH, D-52425 Julich, Germany.

Physical Review Letters
|October 4, 2000
PubMed
Summary

Researchers studied platinum trianions (Pt( -)(3)) using ultrafast lasers. Optically excited states decayed in less than 70 femtoseconds, similar to bulk metals, suggesting rapid electron scattering.

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Area of Science:

  • Physical Chemistry
  • Atomic and Molecular Physics
  • Femtochemistry

Background:

  • Understanding electron dynamics in small metal clusters is crucial for catalysis and materials science.
  • Anions offer unique electronic properties compared to neutral species.
  • Previous studies on metal cluster relaxation times provide a baseline for comparison.

Purpose of the Study:

  • To investigate the excited-state lifetime of the triply negative platinum cluster ion, Pt( -)(3).
  • To explore the mechanisms governing ultrafast electron relaxation in atomic clusters.
  • To compare the relaxation dynamics of Pt( -)(3) with bulk metallic systems.

Main Methods:

  • Time-resolved two-photon photoelectron spectroscopy was employed.
  • Femtosecond laser pulses at 1.5 eV photon energy were used in a pump-probe setup.

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  • Analysis of time-dependent photoelectron distributions provided decay information.

    • Main Results:

    • The lifetime of optically excited states in Pt( -)(3) was determined to be less than 70 femtoseconds.
    • This rapid decay indicates exceptionally fast electron relaxation.
    • The observed lifetime is comparable to relaxation times in bulk metals.

    Conclusions:

    • The ultrafast electron relaxation in Pt( -)(3) is unexpectedly rapid for a triatomic cluster.
    • Inelastic electron-electron scattering is proposed as the dominant relaxation mechanism.
    • These findings suggest that small metal clusters can exhibit metallic-like electron dynamics.