Analysis of surface modifications on graphite induced by slow highly charged ion impact

A. Hida, T. Meguro, K. Maeda, Y. Aoyagi

Research output: Contribution to journalConference articlepeer-review

15 Citations (Scopus)


Modifications of the highly oriented pyrolytic graphite surfaces induced by the single impacts of slow Ar+ and Ar8+ were investigated by Raman spectroscopy. The difference in the irradiation-induced disorder between Ar+ and Ar8+ was clearly revealed by comparing two kinds of changes in Raman features against ion fluences: one is the peak intensity ratio of the disorder-induced peak with respect to the E2g-mode peak in the first-order Raman spectra, and the other is the full width at half maximum of the E2g-mode peak. Judging from the peculiar dependence of them on the fluence of Ar8+, it was assumed that the defects introduced by Ar8+ impacts is not simple vacancies as is the case of Ar+ impacts but vacancy clusters. The formation mechanism of vacancy clusters under Ar8+ irradiation was also discussed from the change in the second-order Raman spectra.

Original languageEnglish
Pages (from-to)736-740
Number of pages5
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Publication statusPublished - May 2003
EventHCI - 2001 - Caen, France
Duration: 1 Sep 20026 Sep 2002


  • Defect structure
  • Graphite
  • Highly charged ion
  • Raman spectroscopy


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