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The electrons go in two by two: Scanning tunneling microscopy (STM)/spectroscopy (STS), shows the Mo154 giant wheel cluster to have a unique localization of states within each of the 14 identical compartments forming its necklace-type structure (see picture). Each compartment contains two delocalized electrons. These states make the system different from conventional quantum dots that have completely free electrons or excitonic states.
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Zhong et al. (2011) studied this question.
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