Regensburg 2013 – scientific programme

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O: Fachverband Oberflächenphysik

O 45: Metal Substrates II

O 45.5: Talk

Wednesday, March 13, 2013, 11:30–11:45, H42

Study of Alloyed Gold Surfaces by Photon Emission STM — Birsen Kesik, Elif Peksu, Selman Tamer, Dilek Yildiz, and •Oğuzhan Gürlü — Istanbul Technical University, Department of Physics, Maslak, 34469, Istanbul, Turkey

Photon emission from surfaces, simultaneously with the surface topography measurements with Scanning Tunneling Microscopy was observed on various surface systems. Several types of photon detection mechanisms were developed. Regardless of the surfaces under consideration or the set up used, it is well known that the photon emission spectrum and intensity heavily depends on both the tip material and the tip geometry. We modified a commercial STM and implemented our photon collection setup; also a modified tip preparation procedure was employed. Using this setup we studied the photons emitted from different gold surfaces with various surface morphologies. Contrary to common knowledge, the intensity of the photon emission from similar regions of a rough Au surface was observed to be different. The local surface morphology was correlated to the photon emission intensity, as well as to the spectrum of the emitted photons. Here we suggest the possible dependence of the intensity and spectra of the emitted photons on the local alloying of the gold surfaces (Supported by TUBITAK 109T687).