Abstract
Low‐temperature ultrahigh‐vacuum (UHV) scanning tunneling microscopy (STM) and spectroscopy (STS) were employed to analyze the electronic structure of Au55 clusters stabilized by [P(C6H5)3]12Cl6 ligands. At low temperature, the thermal motion of the clusters as well as the thermal drift of the STM are reduced, so that measurements can be performed reproducibly with highest spatial and spectroscopic resolution. At 7 K we imaged for the first time the actual arrangement of the C6H5 rings of the ligand molecules. Spectroscopic data acquired from well defined locations within a cluster reveal energy‐level splitting which can be attributed to the Au55 core. The individual energy levels are deduced by using a Monte Carlo simulation of electronic transport through a double tunnel junction. Experimental results are compared with those obtained by density‐functional tight‐binding calculations.
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