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This document discusses the nature of the second optical transition observed in the absorption spectrum of PbSe nanocrystals. There has been debate about whether this transition corresponds to the 1Sh,e1Pe,h transition or the 1Ph1Pe transition. The authors use pump-probe spectroscopy to control the occupation of the 1S electron and hole states and find that the second transition is not bleached even when these states are occupied. This provides conclusive evidence that the 1S states are not involved in the

Author

emediage

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EN