About the temperature distribution in track forming insulators after the impact of swift heavy ions

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Abstract

Track radii R e are related to the maximum width of the ion-induced radial temperature increase ΔT(r, t) at T = T m (T m - melting temperature). This maximum is reached at t = 0. When S e/N = constant (S e, N are the electronic stopping power and the number density of atoms), the experimental R e, T m data pairs measured in various insulators form a Gaussian curve Θ(r) for the ranges E < 2 MeV/nucleon and E > 8 MeV/nucleon (E - specific ion energy). Θ(r) does not depend on materials parameters. It has the same width w = 4.5 nm for a broad range of E while its maximum temperature depends on S e/N and the velocity of the projectiles. The experimental relation between R e and T m described by Θ(r) is possible only if ΔT(r, 0) = Θ(r). Thus the ion-induced temperature distribution ΔT(r, 0) is identical for a number of insulators when S e/N = constant in the two ranges of E. The results prove that the heat flow equation is not valid under spike conditions.

Original languageEnglish
Pages (from-to)88-92
Number of pages5
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume280
DOIs
Publication statusPublished - Jun 1 2012

Keywords

  • Insulators
  • Ion energy
  • Swift ions
  • Thermal spike
  • Tracks

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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