Exciton stale

PA at l. 48 eV appeal s instantaneously, shows spectral relaxation to the red, and decays on the same timescale of SE, as shown in Figure 8-9. We assign the observed PA to singlet Bu exciton transitions towards higher lying even parity (A ) states. We can speculate on the nature of this state within the proposed model. A possible candidate for the final slate is the inirachain biexciton. However, its energy level is located below the two-exciton stale by an amount equal to the bind-... 

In summary, over a large range of interchain distances, the most stable species photogenerated in the lowest excited stale of clusters formed by identical molecules are excitons mostly with an intrachain character. The calculations also show that po-laron-pairs, also referral to as interchain excitons (corresponding to a positive polar-... 

Given the energy and dipole length of a mr transition of naphthalene compute the energies and dipole lengths of the consequent stales of 2,2 -binaphthyl. Assume no intermolecular overlap, and use the dipole approximation to exciton theory. 

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