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Dissociative photoionization of polycyclic aromatic hydrocarbon molecules carrying an ethynyl group | | Gaël Rouillé
; Serge A. Krasnokutski
; Daniele Fulvio
; Cornelia Jäger
; Thomas Henning
; Gustavo A. Garcia
; Xiao-Feng Tang
; Laurent Nahon
; | | Date: |
2 Aug 2015 | | Abstract: | The life cycle of the population of interstellar polycyclic aromatic
hydrocarbon (PAH) molecules depends partly on the photostability of the
individual species. We have studied the dissociative photoionization of two
ethynyl-substituted PAH species, namely, 9-ethynylphenanthrene and
1-ethynylpyrene. Their adiabatic ionization energy and the appearance energy of
fragment ions have been measured with the photoelectron photoion coincidence
(PEPICO) spectroscopy technique. The adiabatic ionization energy has been found
at 7.84 +/- 0.02 eV for 9-ethynylphenanthrene and at 7.41 +/- 0.02 eV for
1-ethynylpyrene. These values are similar to those determined for the
corresponding non-substituted PAH molecules phenanthrene and pyrene. The
appearance energy of the fragment ion indicative of the loss of a H atom
following photoionization is also similar for either ethynyl-substituted PAH
molecule and its non-substituted counterpart. The measurements are used to
estimate the critical energy for the loss of a H atom by the PAH cations and
the stability of ethynyl-substituted PAH molecules upon photoionization. We
conclude that these PAH derivatives are as photostable as the non-substituted
species in HI regions. If present in the interstellar medium, they may play an
important role in the growth of interstellar PAH molecules. | | Source: | arXiv, 1508.0259 | | Services: | Forum | Review | PDF | Favorites | |
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