Multiple Occupancy of Triply Degenerate States in Icosahedral Symmetry

Low-energy excitations of a linearly Jahn-Teller coupled orbital quintet

“…Understanding the general features of a vibronic spectrum is a necessary step towards the interpretation and assignment of the spectra of molecules and molecular ions. This has been undertaken and carried out quite extensively for electronic doublets, triplets [38,40,41] and more complex electronic configurations [35,42,43]. The present paper fills a gap in the theory of icosahedral systems, providing general guidelines for the interpretation of vibronic PES of the electronic quintet in the h ⊗ (G + H), restricting to the idealization of a single mode.…”

Introduction to Organic Solar Cells

“…Thus, hundreds of novel polymeric p-type materials have been designed, synthesized, and used in OSCs studies resulting in efficiency over 10 % [11]. The dominant n-type materials are fullerene derivatives due to their triplet degeneration of LUMO [30], fast charge splitting [31], and good electron mobility [32]. However, their weak absorption in the visible region rooted from their symmetric forbidden properties [33,34] inspired the discovery of novel non-fullerene acceptors.…”