Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p..82g&link_type=abstract
The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole
Astronomy and Astrophysics
Astronomy
Scientific paper
i-system into the empty σ-orbital, although this compromises the aromaticity of the system and leads to a triplet state. While a singlet state has now been firmly established for the phenyl cation, the stability of the triplet in larger polyaromatic species increases as result of the growing %B i-system, thus reducing the energy required to transfer an electron to the empty σ-orbital. Observation of the triplet state of isolated naphthyl+, phenanthyl+ and pyrenyl+ systems is undertaken by IR multiple-photon dissociation (IRMPD) spectroscopy using a tunable free electron laser. The establishment of a triplet ground state for these PAH species possibly invokes new scenarios to be considered, such as regarding the triplet-state chemistry of PAH molecules and the altered optical properties. After reviewing the experimental aspects of this work, possible consequences of a triplet ground state of PAH species are briefly outlined.
Galué H. Á.
Oomens Jos
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