The absorption of a single photon can cause the excitation of more than one electron, but the mechanism of this 'multi-exciton generation' process is elusive. Now, calculations on pentacene show that geometrical distortions and intermediate excited states assist in producing two excited electrons from one photon.
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Siebbeles, L. Two electrons from one photon. Nature Chem 2, 608–609 (2010). https://doi.org/10.1038/nchem.720
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DOI: https://doi.org/10.1038/nchem.720
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