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O: Oberflächenphysik
O 47: Rastersondentechniken III
O 47.9: Vortrag
Dienstag, 8. März 2005, 17:45–18:00, TU EB202
STM induced light emission spectroscopy of individual C60 molecules — •Elizabeta Ćavar, Marie-Christine Blüm, Marina Pivetta, François Patthey, and Wolf-Dieter Schneider — Institut de Physique des Nanostructures, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
The tunneling electrons from a Pt/Ir STM tip were used as an excitation source to locally investigate optical transitions of individual C60 molecules. Experiments were performed with a home built STM operating in ultra-high vacuum and at a temperature of 50 K. The C60 molecules were sublimated on ultrathin NaCl(001) film on Au(111). Topography images revealed C60 nanocrystals in the hexagonal and truncated triangular form with an average side length between 30 and 80 nm and a maximal height of 4 layers. The molecules form hexagonal layers with an intermolecular distance of 1nm. Light emission spectra from individual C60 molecules show several peaks in the wavelength range between 670 and 900 nm which are assigned to the characteristic C60 luminescence.