Figure 1.

Polarized Linear Absorption Spectra of Single Crystalline Hexacene

(A) Optical image of one of hexacene single crystals in our experiments.

(B) The schematic of a unit cell of hexacene single crystal.

(C) Polarization resolved linear absorption spectra in the a-b plane of hexacene single crystals along the a (upper) and b (lower) axes. The dotted curves are the theoretical results. The lowest transition along the a axis is located at 761 nm, whereas the lowest transition along the b axis is located at 835 nm. The singlet Davydov splitting exhibits a large value of 144 meV in hexacene single crystals.