Cluster–surface interaction studied by time-resolved two-photon photoemission


+ clusters (n=2-9)deposited onto highly oriented pyrolytic graphite (HOPG) substrates at liquid nitrogen temperatures. The deposition was carried out with variable kinetic energies of the clusters. Clusters deposited with high kinetic energy (up to 60 eV/cluster) become fragmented upon impact. For low deposition energies (1–4 eV/cluster) 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 soft deposited clusters retain their size and identity on the sample. The phase of the odd/even effect suggests that transient negatively charged cluster ions serve as an intermediate step in the two-photon photoemission process. The lifetime of the anions rises with cluster size. This is attributed to an increasing electronic density of states for larger clusters.

This is a preview of subscription content, access via your institution.

Author information



Additional information

Received: 26 October 1998 / Revised version: 16 December 1998

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Busolt, U., Cottancin, E., Röhr, H. et al. Cluster–surface interaction studied by time-resolved two-photon photoemission . Appl Phys B 68, 453–457 (1999).

Download citation

  • PACS:; 61.46.+w; 79.60.-i; 78.47.+p