Coulomb explosion at low and high ion velocities

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Abstract

The ion-induced electric field is calculated for estimating the effect of the Coulomb explosion (CE) mechanism. The increase of the kinetic energy of lattice ions in the electric field of the track core is Δ* ∝ (q(0))4, where q(r) is the induced initial charge density. Estimates are made for the irradiation of SiO2 by 2 MeV/nucleon Kr beam: the mean energy of lattice ions reaches 8.1 eV within 4 fs in the track core. The Lorentzian and Gaussian charge density distributions lead to similar results. The type of solids affects Δ* through the charge neutralization time. As a result of the decrease of q(0), Δ* is reduced by about an order of magnitude in the range 2-8 MeV/nucleon. The projectile velocity may affect the formation of ion-induced tracks by the CE mechanism.

Original languageEnglish
Pages (from-to)76-80
Number of pages5
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume298
DOIs
Publication statusPublished - Feb 20 2013

Keywords

  • Coulomb explosion
  • Swift heavy ions
  • Track core
  • Velocity effect

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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