Photochemical stability of polycyclic aromatic hydrocarbons in the interstellar medium.
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The astronomical IR spectra of molecular origin have been attributed to compact polycyclic aromatic hydrocarbons. This interpretation can be rationalized in terms of the percent resonance energies of the excited-state species. In general, large compact polycyclic aromatic hydrocarbons are not only thermodynamically stable but also photochemically stable. These hydrocarbons have large percent resonance energies in the excited state, and are expected to survive the rough conditions in space. In contrast, relatively small aromatic hydrocarbons are greatly destabilized when they are excited electronically or deprived of two π electrons.
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