Dresden 2006 – scientific programme

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DS: Dünne Schichten

DS 24: Poster presentation

DS 24.37: Poster

Tuesday, March 28, 2006, 15:00–17:30, P2

FT-IR studies of Ag/MgO(001) — •Fanzhen Meng, Daniel Seibel, Gerhard Fahsold, and Annemarie Pucci — Kirchhoff-institut für Physik, Heidelberg University, Im Neuenheimer Feld 227, D-69120 Heidelberg, Germany

We present the IRRS (Infrared reflection spectra) of Ag films measured during their growth on MgO(001) at room temperature, at 100 K, and at 50 K. We get a reflectance minimum at a certain thickness. This thickness is comparable to the percolation threshold that we know from our previous IR transmittance measurements [1]. Beyond the percolation threshold, the IRRS of room temperature prepared films show structures quite different to those grown at low temperature. Also, we will show the effect of gas exposure during metal deposition on IR spectra and film morphology at room temperature. For the Ag/MgO(001) system, CO does not show an effect, different to Cu/MgO(001) [2]. However, we detected that hydrocarbon exposure leads to enhanced film roughness. From surface enhanced IR absorption (SEIRA) of adsorbates we get additional information on film morphology.

[1] F. Meng, G. Fahsold and A. Pucci, Phys. Stat. sol.(c), accepted.

[2] M. Lust, A. Priebe, G. Fahsold and A. Pucci, Surf. Interface Anal.33, 487 (2002).