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Polycyclic aromatic hydrocarbon negative ions in interstellar clouds: a quantum study on coronene metastable anions

Authors

  • F. Carelli,

    1. Department of Chemistry and CISM, The University of Rome ‘Sapienza’, P. le Aldo Moro 5, 00185 Rome, Italy
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  • F. A. Gianturco

    Corresponding author
    1. Department of Chemistry and CISM, The University of Rome ‘Sapienza’, P. le Aldo Moro 5, 00185 Rome, Italy
      E-mail: fa.gianturco@caspur.it
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E-mail: fa.gianturco@caspur.it

ABSTRACT

Multichannel quantum scattering calculations are employed to investigate the low-energy (Ecoll≤ 7 eV) region of the interaction between gas-phase neutral coronene and environmental electrons in interstellar clouds. The presence of several resonance features is revealed by our calculations and their symmetry characterization is also reported. Their likelihood of leading to anionic stabilization for the title molecule via different transient negative ions formed at low electron energies is also discussed and analysed through the present findings. These results bear significant information on the possible role of negative ions originating from the larger members of the polycyclic aromatic hydrocarbons in the interstellar medium.

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