Abstract
A direct experimental comparison of reflectance-anisotropy spectra (RAS) and spectroscopic second harmonic generation (SHG) of both native-oxidized and clean, reconstructed vicinal Si(001) surfaces is presented. SHG rotational anisotropy over the 2-photon energy range 2.75 < hν SH < 3.44 eV is analyzed using a simplified bond hyperpolarizability model, yielding empirically fitted complex hyperpolarizability spectra β (2ω ) of step-edge, terrace- and back-bonds. Linear bond polarizabilities α (2ω ) were then derived from β (2ω ) using a simple oscillator model. Measured RAS was successfully reproduced with these α (2ω ) for all surfaces studied. The results demonstrate a simple empirical approach for accessing the common microscopic origin of RAS and SHG. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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