Mixing of nuclear and electronic stopping powers in the formation of surface tracks on mica by fullerene impact

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Abstract

The experimental results on ion-induced hillocks on mica were analyzed in the range of 0.025 < E < 35 MeV/nucleon. The thermal spike was characterized quantitatively by the parameters derived in our previous track studies. The hillock height h varies linearly with the spike energy ε = gSe + βSn with a threshold εth = 3.8 keV/nm, where Se and Sn are the electronic and nuclear stopping powers and g is the efficiency. A calculation by the SRIM code provides β = 0.9 and 0.33 for Cn and Cun, Gen ions, respectively. From the slope of the h-ε line we obtained v/D = 0.36 nm-1, where v is the velocity of emergence of the hillocks and D is the thermal diffusivity. Our estimate is D < 0.057 cm2/s in the spike, which is much lower than the value, obtained by the free electron approximation. The results confirm on an absolute scale that only about 17/40% of Se is transferred into thermal energy at high/low E values and the equilibrium melting point is a good parameter in the conditions of a spike.

Original languageEnglish
Pages (from-to)27-31
Number of pages5
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume191
Issue number1-4
DOIs
Publication statusPublished - May 1 2002

Keywords

  • AFM
  • Ion irradiation
  • Thermal spike

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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