Fig. 3
From: Robust singlet fission in pentacene thin films with tuned charge transfer interactions
Effects of incorporation of spacer molecules on Davydov splitting. a Davydov splitting (DS) of the lowest electronic excitation in PEN in PEN:DIP (purple circles) and PEN:PIC (green diamonds). For comparison, the DS resulting from calculations based on the lattice parameters of PEN:DIP (white squares), which has been scaled by a factor of 1.3 in order to match the experimental results at fPEN = 1, is also shown. b Comparison of the absorption spectrum of PEN if nearest neighbors (blue) are replaced by a spacer molecule (orange). In the mixed lattices fPEN = 0.5 and periodicity is maintained. The components of the spectrum polarized along a and b are normalized by the absorption maximum
