Regensburg 2025 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 8: Optical Analysis of Thin Films I

DS 8.3: Vortrag

Mittwoch, 19. März 2025, 12:30–12:45, H3

Investigation of metal surfaces using Surface Resonant Raman Scattering — •Sarang Bhasme, Mariella Denk, Simon Kalteis, and Peter Zeppenfeld — Johannes Kepler University, Linz, Austria

We have recently demonstrated the possibility to investigate surface phonons on metals by surface resonant Raman spectroscopy (SRRS), in which the Raman cross section is significantly enhanced by resonant excitation of optical transitions involving surface electronic states [1]. Here we report new investigations regarding the phonon and electron scattering mechanism on clean and adsorbate-modified Cu(110) surfaces using SRRS and reflectance difference spectroscopy (RDS) under ultra-high vacuum (UHV) conditions and variable temperatures. We have modified the Cu(110) surface electronic states via ion bombardment and by adsorption of small molecules such as oxygen or CO to explore its effect on the Raman signals. We find that both the phonon and the electron related scattering strongly depend on the details of the surface cleanliness and structural properties, underscoring the influence of the surface electronic structure and adsorbate interactions on the Raman signatures.

[1] M. Denk et al., Phys. Rev. Lett. 128, 216101 (2022).

Keywords: Metal Surfaces; Raman Spectroscopy; Surface Electronic Structure; Surface Phonons