Energetic ion bombardment of Ag surfaces by C60+ and Ga+ projectiles

Shixin Sun, Christopher Szakal, Nicholas Winograd, Andreas Wucher

Research output: Contribution to journalArticle

28 Scopus citations

Abstract

The ion bombardment-induced release of particles from a metal surface is investigated using energetic fullerene cluster ions as projectiles. The total sputter yield as well as partial yields of neutral and charged monomers and clusters leaving the surface are measured and compared with corresponding data obtained with atomic projectile ions of similar impact kinetic energy. It is found that all yields are enhanced by about one order of magnitude under bombardment with the C60+ cluster projectiles compared with Ga+ ions. In contrast, the electronic excitation processes determining the secondary ion formation probability are unaffected. The kinetic energy spectra of sputtered particles exhibit characteristic differences which reflect the largely different nature of the sputtering process for both types of projectiles. In particular, it is found that under C60+ impact (1) the energy spectrum of sputtered atoms peaks at significantly lower kinetic energies than for Ga+ bombardment and (2) the velocity spectra of monomers and dimers are virtually identical, a finding which is in pronounced contrast to all published data obtained for atomic projectiles. The experimental findings are in reasonable agreement with recent molecular dynamics simulations.

Original languageEnglish (US)
Pages (from-to)1677-1686
Number of pages10
JournalJournal of the American Society for Mass Spectrometry
Volume16
Issue number10
DOIs
StatePublished - Oct 1 2005

All Science Journal Classification (ASJC) codes

  • Structural Biology
  • Spectroscopy

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