Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 6: Organic Molecules on Inorganic Substrates I: Electronic, Optical and other Properties

O 6.6: Vortrag

Montag, 16. März 2020, 12:00–12:15, REC C 213

Good Vibrations - Mode Coupling in Fatty Acids — Michael Lackner, •Marvin Hille, and Eckart Hasselbrink — University of Duisburg-Essen, Essen, Germany

Internal vibrational energy distribution (IVR) in molecules is fundamental for understanding their chemical reactivity and research in this field has gained a lot of popularity in the past. It is, however, still fair to say that predictive power over the energy flow in vibrationally excited molecules has yet to be obtained. We will present newest findings regarding the energy flow dynamic of a fatty acid Langmuir-Blodgett film on a picosecond scale. Vibrational sum frequency generation (vSFG) spectroscopy allows precise monitoring of resonant vibrations of an adsorbate monolayer. In our setup we use a resonant ps narrowband IR laser pulse for pumping and a fs broadband IR-visible pulse pair for vSFG probing of the monolayer. Using this pump-probe setup we observed a very fast (< 2ps) energy transfer to the other modes when pumping the anti-symmetric methyl or methylene stretch, followed by a longer decay (~85 ps) into presumably bending and internal rotational modes.