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Time of flight mass spectrum of the gold clusters synthesized by the surfactant-mediated aqueous route. Taking the masses of the gold, thiol, and surfactant into account, the labeling in the mass spectrum is done by exact matching with the theoretical mass. No larger clusters are detected even if the mass is scanned up to 10 000 amu The inset is the TOF spectrum corrected for the background. The isotope matching was done using the IPC software and is represented by vertical bars in the inset.
The room temperature experimental absorption (left arrows) and emission spectra (right arrows) of the clusters-assembled nanoparticles. The black solid line spectra marked by and are the optical absorption spectra of the colloidal as grown and resin treated Au cluster samples, respectively. Inset (a) is the magnified absorption spectrum of the resin treated sample. The emission spectra of the as-prepared and resin-treated Au clusters denoted by the gray solid line are labeled and , respectively. Inset (b) summarizes the optical absorption edge wavelengths and emission peak wavelengths for various numbers of Au atoms per cluster (see text for references), which are shown in the —●— line and ⋯◼⋯ line, respectively. The optical absorption edge and emission peak wavelengths of our as-prepared Au clusters are also shown by the open circle and open square, respectively, in the inset.
Optical absorption (solid line) and emission spectra (dotted line) of the planar--shaped cluster using the TD-B3LYP/LAN2DZ. Inset (a) is the optical absorption (solid line) and emission (dotted line) spectra of the star isomer calculated using the TD-B3LYP/LAN2DZ. The B3LYP/LANL2DZ-optimized geometry of an cluster with the planar-and star shaped geometries are shown as insets in the respective spectra.
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