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Two photon photoemission of cited deposited silver clusters

  • U. Busolt
  • E. Cottancin
  • H. Röhr
  • L. Socaciu
  • T. Leisner
  • L. Wöste
Conference paper

Abstract

We use time resolved two photon photoemission to study the stability of size selected silver clusters deposited onto highly oriented pyrolytic graphite (HOPG) substrates. Size-selected Ag n + clusters (n = 2 − 9) are deposited at low coverage onto HOPG surfaces at liquid nitrogen temperatures. After deposition, the samples are irradiated by a series of ultrashort laser pulse pairs. Photoelectrons created by two photon photoemission are collected in a magnetic bottle type time-of-flight photoelectron spectrometer. Their kinetic energy distribution is recorded as a function of the delay time between subsequent light pulses. With the exception of Ag3 the size dependence of the photoelectron spectra reveals a pronounced odd/even effect, which is well known for gas phase silver clusters. This indicates that the deposited clusters retain their size and identity on the sample. The lifetime of the photoexcitation rises with cluster size. This is attributed to an increasing electronic density of states for larger clusters.

PACS

36.40.Sx Diffusion and dynamics of clusters - 61.46.+w Clusters Nanoparticles and nanocrystaline materials - 79.60.-i Photoemission and photoelectron spectra 78.47.+p Time-resolved optical spectroscopies and other ultrafast optical measurement in condensed matter 

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Copyright information

© Springer-Verlag Italia 1999

Authors and Affiliations

  • U. Busolt
    • 1
  • E. Cottancin
    • 1
  • H. Röhr
    • 1
  • L. Socaciu
    • 1
  • T. Leisner
    • 1
  • L. Wöste
    • 1
  1. 1.Fachbereich PhysikFreie Universität BerlinBerlinGermany

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