Transient absorption microscopy (TAM) has been extremely successful in quantifying singlet and triplet exciton diffusion rates in organic semiconducting materials. In TAM, a system is photoexcited at one location and the electronic response is probed at another location. By scanning over multiple photoexcitation positions, TAM is capable of tracking exciton transport dynamics with ~50 nm spatial precision and femtosecond temporal resolution. Previous TAM studies in tetracene crystals revealed a cooperative transport mechanism, in which the effective triplet exciton diffusion constant is enhanced by an order of magnitude by a singlet-mediated transport mechanism. More recently, TAM has been used to identify the role of intermolecular interactions in mediating fast exciton diffusion in tethered perylene bisimide derivatives and perylene diimide derivatives. These works provide direct evidence that increasing intermolecular interactions through informed molecular design can drastically alter the excited state dynamics by increasing the exciton transport rate or increasing the lifetime of the charge separated states. While these studies provide crucial insight into the role of macromolecular morphology in driving ultrafast photophysical phenomena, TAM does not directly probe the role of phonon lattice vibrations in exciton diffusion dynamics.