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Study of clean and oxygen-covered Ag surfaces using optical reflectance anisotropy

1997; Elsevier BV; Volume: 377-379; Linguagem: Inglês

10.1016/s0039-6028(96)01440-9

1879-2758

V. Fernandez, D. Pahlke, N. Esser, K. Stahrenberg, O. Hunderi, A. M. Bradshaw, W. Richter,

Gold and Silver Nanoparticles Synthesis and Applications

We report measurements of the azimuthal anisotropy in the normal incidence reflectance of clean and adsorbate-covered single crystal Ag(110) surfaces. Reflectance anisotropy spectra were taken between 1.5 and 5.5 eV photon energy. Previous studies in air had indicated a very large anisotropy in the region around the surface plasmon energy. On the clean surface this feature is strongly reduced compared to that observed on a contaminated surface. By oxygen dosage the (1 × 1) surface structure is modified to (4 × 1) and (2 × 1) as displayed by LEED. The simultaneously observed optical anisotropy shows a correlation with oxygen coverage and restores to a large extent the anisotropy observed in air.