Dresden 2009 – scientific programme

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O: Fachverband Oberflächenphysik

O 45: Heterogeneous catalysis

O 45.2: Talk

Thursday, March 26, 2009, 10:45–11:00, SCH A215

Studies on the substrate mediated vibrational excitation of CO/Si(100) by means of SFG spectroscopy — Xu Han, Kristian Lass, •Thorsten Balgar, and Eckart Hasselbrink — Universität Duisburg-Essen, Fachbereich Chemie, 45117 Essen, Germany

Vibrational excitations of adsorbates play an important role in chemical reaction dynamics. In the past decade CO on solid surfaces was chosen as adequate model system for studying vibrational relaxation dynamics [1 - 3]. Our work is focused on the energy dissipation of vibrationally excited CO adsorbed on a silicon surface by means of IR/Vis sum frequency generation (SFG) spectroscopy [4, 5]. Here we present studies on substrate mediated excitation of vibrational modes of CO on Si(100) induced by UV radiation. We suppose the observation of highly excited internal stretch vibrations of CO caused by hot electrons generated within the silicon substrate.

[1] A. Tadjeddine, A. Le Rille, O. Pluchery, F. Vidal, W.Q. Zheng, A. Peremans, Phys. Status Solidi A 175 (1999) 89 [2] H. Ueba, Prog. Surf. Sci. 55 (1997) 115 [3] M. Buck, M. Himmelhaus, J. Vac. Sci. Technol. A 19 (2001) 2717 [4] K. Lass, X. Han, E. Hasselbrink, J. Chem. Phys. 123 (2005) 051102 [5] K. Lass, X. Han, E. Hasselbrink, Surf. Sci. 600 (2006) 4275