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Molecule-like Photodynamics of Au102(pMBA)44 Nanocluster

Photophysical properties of a water-soluble cluster Au102(pMBA)44 (pMBA = para-mercaptobenzoic acid) are studied by ultrafast time-resolved mid-IR spectroscopy and density functional theory calculations in order to distinguish between molecular and metallic behavior. In the mid-IR transient absorption studies, visible or near-infrared light is used to electronically excite the sample, and the subsequent relaxation is monitored by studying the transient absorption of a vibrational mode in the ligands. Based on these studies, a complete picture of energy relaxation dynamics is obtained: (1) 0.5–1.5 ps electronic relaxation, (2) 6.8 ps vibrational cooling, (3) intersystem crossing from the lowest triplet state to the ground state with a time constant 84 ps, and (4) internal conversion to the ground state with a time constant of ∼3.5 ns. A remarkable finding based on this work is that a large cluster containing 102 metal atoms behaves like a small molecule in a striking contrast to a previously studied slight...

Authors:   Satu Mustalahti; Pasi Myllyperkiö; Sami Malola; Tanja Lahtinen; Kirsi Salorinne; Jaakko Koivisto; Hannu Häkkinen; Mika Pettersson
Journal:   ACS Nano
Year:   2015
DOI:   10.1021/nn506711a
Publication date:   26-Feb-2015
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