Molecular hydrogen formation on interstellar PAHs through Eley-Rideal abstraction reactions

Nolan Foley, S. Cazaux, D. Egorov, L. M.P.V. Boschman, R. Hoekstra, T. Schlathölter

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)

Abstract

We present experimental data on H2 formation processes on gas-phase polycyclic aromatic hydrocarbon (PAH) cations. This process was studied by exposing coronene radical cations, confined in a radio-frequency ion trap, to gas-phase H atoms. Sequential attachment of up to 23 hydrogen atoms has been observed. Exposure to atomic D instead of H allows one to distinguish attachment from competing abstraction reactions, as the latter now leave a unique fingerprint in the measured mass spectra. Modelling of the experimental results using realistic cross-sections and barriers for attachment and abstraction yield a 1:2 ratio of abstraction to attachment cross-sections. The strong contribution of abstraction indicates that H2 formation on interstellar PAH cations is an order of magnitude more relevant than previously thought.

Original languageEnglish
Pages (from-to)649-656
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Volume479
Issue number1
DOIs
Publication statusPublished - 1 Sep 2018

Keywords

  • Astrochemistry
  • ISM: molecules
  • Molecular processes

Fingerprint Dive into the research topics of 'Molecular hydrogen formation on interstellar PAHs through Eley-Rideal abstraction reactions'. Together they form a unique fingerprint.

Cite this