Computer simulation of crystal surface smoothing by accelerated cluster ion impacts

Z. Insepov, I. Yamada

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Gas cluster ions accelerated to high kinetic energies can be used successfully for surface modification. The most impressive result of cluster ion irradiation appears to be a surface smoothing effect: a rough surface containing valleys and hills of average heights of the order of 100 Å becomes almost flat with the residual roughness reduced by a factor of 10. The Langevin dynamics based on the Kardar-Parisi-Zhang equation, combined with a Monte-Carlo procedure for crater formation, was used for simulation of the surface modification at cluster ion impacts. We found that for a crater size of the order of 20 Å, significant smoothing occurs after irradiation by approximately 103 cluster impacts; this was confirmed by experiment at dose of 1013 ions cm-2. The rate of the smoothing process depends on the value of surface diffusion coefficients, and can be accelerated significantly if the lateral sputtering phenomenon is taken into account.

Original languageEnglish
Pages (from-to)89-93
Number of pages5
JournalMaterials Science and Engineering A
Volume217-218
DOIs
Publication statusPublished - Oct 30 1996

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Keywords

  • Cluster ion impact
  • Computer simulation
  • Crystal surface smoothing

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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