The strongest peak in the spectrum in Figure (a) stems from the P1 polaron excitations on either doped oligomer. These excitations are each well described by NTO pairs located on a single conjugated chain as shown in Figs. ) and (d). Both excitations show clear ππ * character and constitute the P1 polaron transitions. In addition, the excitations at around 770 nm can also be identified as P1 transitions whereas the excitation at 880 nm features both a P2 and an intermolecular contribution (not shown).