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Lyα irradiation of superhydrogenated coronene films: Implications for h2 formation

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  • V. Mennella, Osservatorio Astronomico di Capodimonte
  • ,
  • T. Suhasaria, Osservatorio Astronomico di Capodimonte
  • ,
  • L. Hornekær
  • J. D. Thrower
  • G. Mulas, Universite Toulouse III - Paul Sabatier, Osservatorio Astronomico di Cagliari

We present the results of an experimental study of the interaction of Lyα photons with superhydrogenated coronene films. The effects of ultraviolet (UV) irradiation have been analyzed with infrared spectroscopy. The spectral changes provide evidence for UV photodestruction of the C-D bonds of the superhydrogenated coronene with a cross section of 8 ± 2 × 10-20 cm2. The comparison of our experimental result with the prediction from theoretical modeling suggests an extension of the region inside photodissociation regions where superhydrogenated coronene can survive and contribute to H2 formation. H2 formation through abstraction in superhydrogenated coronene dominates over direct H2 loss induced by UV photodestruction.

Original languageEnglish
Article numberL18
JournalAstrophysical Journal Letters
Number of pages7
Publication statusPublished - Feb 2021

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