Evgeny E. Ostroumov

TL;DR: The description of energy transfer, in particular multichromophoric antenna structures, is shown to vary depending on the spatial and energetic landscape, which dictates the relative coupling strength between constituent pigment molecules.

TL;DR: This work proposes a three-step model of singlet fission that includes two triplet-pair intermediates and shows how transient spectroscopy can distinguish initially interacting triplet pairs from those that are spatially separated and noninteracting.

TL;DR: 2D electronic spectroscopy measurements on light-harvesting proteins from purple bacteria and isolated carotenoids revealed a well-resolved signal consistent with a previously postulatedCarotenoid dark state, the presence of which was confirmed by global kinetic analysis and points to this state’s role in mediating energy flow from carotensoid to bacteriochlorophyll.

TL;DR: Bulky side chains promote a molecular packing and intermolecular coupling that effect high-efficiency singlet fission in amorphous solids of pentacene derivatives.

TL;DR: These experiments explicitly show that the coherences-although in the ground electronic state-can be probed at the absorption resonances of other bacteriochlorophyll molecules because of delocalization of the electronic excitation over several chromophores.