Excitons in conjugated polymers sometimes require two or more π * orbitals with different phases in order to describe the excited-state wave function, analogous to the 1 L b state of the linear acenes (Fig. ). Alternatively, exciton localization can create a situation in which a single molecule effectively exhibits more than one chromophore, which are then electronically coupled due to their spatial proximity. Typically, that situation also leads to more than one significant eigenvalue of ∆P elec . Poly(pphenylene vinylene) or PPV chromophores exhibit these behaviors and we next examine an isomer of (PPV) 8 in which two of the vinylene moieties are in the cis configuration while the others are trans, which creates "kinks" in the geometry that can induce excited-state localization. An all-trans isomer of (PPV) 8 is considered in the Supporting Information (Table and Fig. ) and exhibits many of the same features and trends, demonstrating that the observations presented below are not unique to this "bent" isomers (PPV) n .