Abstract
The first two peaks of the optical extinction spectrum of PbSe nanocrystals in solution have been assigned in the literature to the 1Sh1Se and 1Ph1Pe transitions. In the present work we assign the transitions causing extinction in the energy region between these two lowest-energy peaks. Our femtosecond transient absorption data indicate that optical extinction in this region is neither due to Rayleigh scattering nor due to local-field effects but due to the formally forbidden 1Ph1Se and 1Sh1Pe transitions.
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