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O: Fachverband Oberflächenphysik
O 86: Surface dynamics
O 86.6: Vortrag
Donnerstag, 12. März 2026, 16:30–16:45, HSZ/0403
Surface Resonant Raman Scattering of Ag(110) surfaces — Sandhya Chandola1,2, •Norbert Esser1, Mohamed Yassine Fatihi3, and Simone Sanna3 — 1Institut für Festkörperphysik,TU Berlin, Hardenbergstr. 36, 10623 Berlin, Germany — 2Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Schwarzschildstr. 8, 12489 Berlin, Germany — 3Institut für Theoretische Physik, Heinrich-Buff-Ring 16, 35392 Gießen, Germany
The phonon and electron scattering mechanism on Ag(110) surfaces is investigated using Surface Resonant Raman scattering (SRRS) and Reflectance Anisotropy Spectroscopy (RAS) in ultra-high vacuum (UHV). The surface electronic transition is clearly visible with RAS, with Raman spectra showing surface phonons near the resonant excitation. A low energy peak is also seen, which should be related to the Rayleigh mode at the Brillouin zone edge. This shows that the surface is rough, and that the intensity of this mode depends on the sample treatment. Consequently, RAS together with Raman spectroscopy allows optimization of surface reconstruction and control of surface morphology. By means of first-principles calculations within density functional theory, we demonstrate that the dominant Raman signature is coupled to an electronic transition between localized surface-states (calculated at 1.6 eV). The corresponding surface-localized phonon mode enhances the distance between the topmost surface layers. The combined experimental and theoretical approach to resonant surface Raman spectroscopy establishes a powerful tool for investigating surface vibrational dynamics and electron-phonon interactions.
Keywords: Ag(110); Raman; Surface phonons; Resonant enhancement; DFT