We have investigated the topography and the local electronic structure of compact Aus5 cluster pellets by scanning tunnelling microscopy (STM) at room temperature. Surface topography and differential conductivity (aZ/av) were measured simultaneously. Additionally, I(V) curves were taken at particular locations on the surface. The topographies generally show largely ideally arranged individual clusters, while also a few agglomerates of several clusters could be observed. The surfaces exhibit a nearly homogeneous differential conductivity, whereby some clusters produce a striking <). Z(V) curves for various probe-sample separations show a strong dependence on the tunnelling impedance and are highly non-linear for large probe-sample separations.
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