The fragment-based and perturbation theories treatment of the excited benzene excimerстатьяИсследовательская статья
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Дата последнего поиска статьи во внешних источниках: 15 октября 2025 г.
Аннотация:The non-orthogonal product approach (NOPA) was combined with complete degenerate active space perturbation theory (CDAS-PT2) in order to investigate the excited electronic states of the benzene dimer molecule (Bz), which is supposed to play a precursor role in the chemical growth of polycyclic aromatic hydrocarbons in the interstellar gas medium. The fraction contribution of Rydberg and charge-transfer states into the total electronic density of low-lying exciton states of Bz was analyzed in the framework of the NOPA. A general mechanism of the photo-induced formation of the Bz excimer states, their subsequent stabilization due to a vibrational relaxation to the minimum of the optically inactive states plus the parallel predissociative decay caused by the intramolecular coupling with repulsive states manifold, is considered.