Abstract

AbstractThe design and the performance of a low‐temperature scanning tunneling microscope (STM) operating in ultrahigh vacuum (UHV) is described. The sample and the STM are cooled by means of a helium bath cryostate. The STM consists of a “beetle”‐type microscope, which is mounted on a spring suspension stage that can be operated between room temperature and 30 K. We present the results of tunneling spectroscopy on ligand‐stabilized Au55‐clusters on a thiol‐covered gold substrate. I(V)‐curves taken at 100 K clearly show coulomb staircase structures, which agree well with theoretical predictions for these structures.

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