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- W2265769312 abstract "Superatom state-resolved dynamics of the Au25(SC8H9)18(-) monolayer-protected cluster (MPC) were examined using femtosecond two-dimensional electronic spectroscopy (2DES). The electronic ground state of the Au25(SC8H9)18(-) MPC is described by an eight-electron P-like superatom orbital. Hot electron relaxation (200 ± 15 fs) within the superatom D manifold of lowest-unoccupied molecular orbitals was resolved from hot hole relaxation (290 ± 20 fs) in the superatom P states by using 2DES in a partially collinear pump-probe geometry. Electronic relaxation dynamics mediated by specific superatom states were distinguished by examining the time-dependent cross-peak amplitudes for specific excitation and detection photon energy combinations. Quantification of the time-dependent amplitudes and energy positions of cross peaks in the 2.21/1.85 eV (excitation/detection) region confirmed that an apparent energetic blue shift observed for transient bleach signals results from rapid hot electron relaxation in the superatom D states. The combination of structurally precise MPCs and state-resolved 2DES can be used to examine directly the influence of nanoscale structural modifications on electronic carrier dynamics, which are critical for developing nanocluster-based photonic devices." @default.
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- W2265769312 date "2016-02-03" @default.
- W2265769312 modified "2023-09-29" @default.
- W2265769312 title "Superatom State-Resolved Dynamics of the Au<sub>25</sub>(SC<sub>8</sub>H<sub>9</sub>)<sub>18</sub><sup>–</sup> Cluster from Two-Dimensional Electronic Spectroscopy" @default.
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- W2265769312 doi "https://doi.org/10.1021/jacs.5b12621" @default.
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