Transition from nanoparticle to molecular behavior: A femtosecond transient absorption study of a size-selected 28 atom gold cluster

Stephan Link, Mostafa A. El-Sayed, T. Gregory Schaaff, Robert L. Whetten

Research output: Contribution to journalArticlepeer-review

113 Scopus citations

Abstract

The ultrafast electron dynamics of chemically prepared gold nanoclusters with a 28 atom gold core surrounded by 16 glutathione molecules were investigated. After excitation with femtosecond laser pulses these clusters show an induced transient absorption in the visible from 2.58 to 1.65 eV (480-750 nm) with a maximum around 2.07 eV (600 nm). The excited state relaxation shows a biexponential decay with a subpicosecond and a longer nanosecond decay time independent of the laser pump power. These results are different from those observed previously for larger gold nanoparticles, which suggests that the Au28-glutathione system shows molecular properties.

Original languageEnglish (US)
Pages (from-to)240-246
Number of pages7
JournalChemical Physics Letters
Volume356
Issue number3-4
DOIs
StatePublished - Apr 22 2002
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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