SKM 2023 – scientific programme

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DS: Fachverband Dünne Schichten

DS 12: Poster

DS 12.31: Poster

Wednesday, March 29, 2023, 17:00–19:00, P3

Ultrafast vibrational dynamics of CH-stretch modes of surface adsorbates — •Tim Lämmerzahl, Nelli Kremer, and Eckart Hasselbrink — University Duisburg-Essen

The understanding of energy transfer between different modes in one molecule, which is called internal vibrational energy redistribution (IVR), is crucial for further development in the field of rate theory and for applications in molecular electronics. As a model we study adsorbate monolayers of a single species using time-resolved two-color pump probe sum frequency spectroscopy.
Previously, we revealed that the coupling between valence vibrations is faster than a few ps and equilibrates with bending and torsion modes on a tens of ps time scale in fatty acid monolayers ^[1]. Now we moved on to conducting surfaces (e.g. gold) and used different terminated alkanethiols. Since gold surfaces exhibit a strong non-resonant (NR) signal, which is usually the dominant source of noise, we used the technique by Dlott et al.^[2] to suppress the NR signal. Results from a study of alkylthiols with different headgroups on gold will be presented.

[1] Lackner, M., Hille, M., Hasselbrink, E. (2019), Phys. Chem. Lett., 11, 108-112.
[2] Lagutchev, A., Hambir, S. A., Dlott, D. D. (2007). J. Phys. Chem. C., 111, 13645-13647.