Abstract
The splittings in S 1 states of molecules containing weakly coupled π-chromophoric groups have been determined through one-and two-photon fluorescence excitation (OPF and TPF) spectroscopy. The 1B 2u state of benzene splits by about 140 cm -1 in the dimer, dihydroanthracene (DHA) and by about 2500 cm -1 in the strained trimer,triptycene (TR). While the exciton splitting in the trans-dimer of acenaphthylene (TDA), in which the two naphthalene moieties are linked by two ethylene bridges, is only 130 cm -1, no such near degeneracies are noticed in two-methylene-bridge-linked dihydrodibenzanthracene (DBA) or dihydropentacene (DHP).
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