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- W3128129554 abstract "Temperature-dependent optical properties are of paramount importance for fundamentally understanding the electron–phonon interactions and phonon modes in atomically precise nanocluster materials. In this work, low-temperature optical absorption spectra of the icosahedral [Au25(SR)18]− nanocluster are measured from room temperature down to liquid helium temperature by adopting a thin-film-based technique. The thin-film measurement is further compared with results from the previous solution-based method. Interestingly, the previously missing core phonon is revealed by a quantitative analysis of the film data through peak deconvolution and fitting of the temperature trend with a theoretical model. The two lowest-energy absorption peaks (at 1.6 and 1.8 eV) of Au25 are determined to couple with the staple-shell phonon (average energy ∼350 cm–1) in the solution state, but in the solid state these electronic transitions couple with the core phonon (average energy ∼180 cm–1). The suppression of the staple-shell phonon in the solid state is attributed to the intracluster and cluster–matrix interactions." @default.
- W3128129554 created "2021-02-15" @default.
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- W3128129554 date "2021-02-09" @default.
- W3128129554 modified "2023-10-01" @default.
- W3128129554 title "Observation of Core Phonon in Electron–Phonon Coupling in Au<sub>25</sub> Nanoclusters" @default.
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- W3128129554 doi "https://doi.org/10.1021/acs.jpclett.1c00050" @default.
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