Investigation of metal surfaces using Surface Resonant Raman Scattering

Description

We have recently demonstrated the possibility to investigate surface phonons
on metals by surface resonant Raman spectroscopy (SRRS), in which the Ra-
man cross section is significantly enhanced by resonant excitation of optical
transitions involving surface electronic states [f]. Here we report new inves-
tigations regarding the phonon and electron scattering mechanism on clean
and adsorbate-modifed 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 clean-
liness and structural properties, underscoring the infuence of the surface elec-
.tronic structure and adsorbate interactions on the Raman signatures.
[1] M. Denk et al., Phys. Rev. Lett. 128, 216101 (2022)

Period	19 Mar 2025
Event title	DPG Spring Meeting of the Condensed Matter Section
Event type	Conference
Location	Regensburg, GermanyShow on map
Degree of Recognition	International