Tunnelspektroskopie mit schnellen Tunnelspannungsrampen - Untersuchungen von Kontaktinstabilitäten und Adsorbaten auf Gold in Gegenwart von Wasser

Scanning tunneling spectroscopy investigations of gold and adsorbates on Au have been realized at ambient conditions. Due to the hydrophilic character of the surface, a thin water layer was adsorbed. Fast bias ramps with a few hundreds of µs duration have been applied to overcome the emerging difficulties. Furthermore discrete tunnel current changes could be observed with the used high-frequency setup. The origins of these fluctuations were examined both in tunneling regime and at nanocontacts.