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Recognized as important interstellar constituents, polycyclic aromatichydrocarbons (PAHs) have been intensively studied in astrochemistry and theirspectroscopy, thermodynamics, dynamics, and fragmentations are now amplydocumented. There exists typical alternatives to the ground-state regularplanar structures of PAHs, as long as they bear internal energies in the range1-10 eV. Resulting from intramolecular rearrangements, such high-lying minimaon the potential- energy surfaces should be taken into consideration in thestudies of PAH processing in astrophysical conditions. Resting upon DFTcalculations mainly performed on two emblematic PAH representatives, coroneneand pyrene, in their neutral and mono and multi-cationic states, this secondsurvey addresses the following alternatives: (1) opened forms containingethynyl or 2- butynyl groups, (2) vinylidene isomers, in which phenanthrenepatterns are reorganized into dibenzofulvene ones, (3) twisted forms, whereexternal CH=CH bonds can be partly twisted, and (4) bicyclobutane forms, inwhich the latter are integrated in saturated bicyclic forms. A few scenariosfor elimination of fragments H, H2, C2H2 and C2H4 are explored. As far aspossible, familiar concepts of organic chemistry, such as aromaticity or Clar'srules, are invoked for interpretations.

PAH chemistry at eV internal energies. 2. Ring alteration and dissociation