Ion-polycyclic aromatic hydrocarbon collisions: kinetic energy releases for specific fragmentation channels

Geert Reitsma*, H. Zettergren, Leon Boschman, Erwin Bodewits, R. Hoekstra, Thomas Schlathölter

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

22 Citations (Scopus)

Abstract

We report on 30 keV He2+ collisions with naphthalene (C10H8) molecules, which leads to very extensive fragmentation. To unravel such complex fragmentation patterns, we designed and constructed an experimental setup, which allows for the determination of the full momentum vector by measuring charged collision products in coincidence in a recoil ion momentum spectrometer type of detection scheme. The determination of fragment kinetic energies is found to be considerably more accurate than for the case of mere coincidence time-of-flight spectrometers. In fission reactions involving two cationic fragments, typically kinetic energy releases of 2-3 eV are observed. The results are interpreted by means of density functional theory calculations of the reverse barriers. It is concluded that naphthalene fragmentation by collisions with keV ions clearly is much more violent than the corresponding photofragmentation with energetic photons. The ion-induced naphthalene fragmentation provides a feedstock of various small hydrocarbonic species of different charge states and kinetic energy, which could influence several molecule formation processes in the cold interstellar medium and facilitates growth of small hydrocarbon species on pre-existing polycyclic aromatic hydrocarbons.

Original languageEnglish
Article number245201
Number of pages9
JournalJournal of Physics B-Atomic Molecular and Optical Physics
Volume46
Issue number24
DOIs
Publication statusPublished - 27-Nov-2013

Keywords

  • GAS-PHASE
  • MASS-SPECTROMETRY
  • AB-INITIO
  • NAPHTHALENE
  • DISSOCIATION
  • DENSITY
  • AZULENE
  • FLAMES
  • CORANNULENE
  • DICATIONS

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