Abstract
Singlet exciton fission is a molecular process wherein an optically prepared singlet exciton dissociates to yield to two triplet excitons. The pair of triplets are formed on sub-picosecond timescales, leading to the assumption that the process is spin-allowed. That is, the pair of triplet excitons are in an overall singlet spin state. Recently however, we have observed a quintet triplet pair state, demonstrating that spin is not conserved. In order to completely understand this process and explain recent spectroscopic measurements, one needs to consider a time-varying spin Hamiltonian. In this presentation I will summarize recent spin-sensitive spectroscopic measurements and outline our theoretical approaches to understanding singlet fission.
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