Fragmentation dynamics of silicon cluster anions in collision with a silicon surface: Contrast to aluminum cluster anions

Akira Terasaki, Hitoshi Yamaguchi, Hisato Yasumatsu, Tamotsu Kondow

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The collision of a size-selected silicon cluster anion, Si-N (8 ≤ N ≤ 12), with a silicon surface was investigated by using a tandem time-of-flight mass spectrometer equipped with an ultrahigh-vacuum collision chamber. The size-selected parent cluster anion, Si-N, was fragmented dominantly into Si-n (n ≈ N/2) in the collision energy range of several electron volts per atom. The measured recoil velocity of the fragment anion from the surface revealed that about 40% of the collision energy is directly converted to the translational kinetic energies of the anion and its counter neutral product scattered from the surface. This conversion efficiency was much higher than that observed for Al-N, aluminum cluster anions, reported previously. This marked contrast indicates that Al-N interacts for a longer time with the surface and transmits its collision energy more efficiently to the surface than Si-N.

Original languageEnglish
Pages (from-to)269-273
Number of pages5
JournalChemical Physics Letters
Issue number3-4
Publication statusPublished - Nov 15 1996
Externally publishedYes


All Science Journal Classification (ASJC) codes

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

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