Critical size for the observation of quantum confinement in optically excited gold clusters

Oleg Varnavski, Guda Ramakrishna, Junhyung Kim, Dongil Lee, Theodore Goodson

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(Figure Presented) We present a systematic study of optical properties of a series of hexanethiolate-capped Au clusters of varying sizes using femtosecond transient absorption, time-resolved fluorescence, and two-photon absorption cross-sectional measurements. An abrupt change in optical properties and their trends has been found at the 2.2 nm size. Displacively excited vibrations with a period of 450 fs have been detected in the transient absorption signal for smaller clusters ≤2.2 nm. These results strongly suggest an emerging optical gap between the highest occupied and lowest unoccupied orbitals in the narrow size range at 2.2 nm.

Original languageEnglish
Pages (from-to)16-17
Number of pages2
JournalJournal of the American Chemical Society
Issue number1
Publication statusPublished - 2010 Jan 13


All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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