Hannover 2016 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 11: Posters 2: Novelties in Molecular Physics: Femtosecond Spectroscopy, Quantum Control, Electronic Spectroscopy, Biomolecules and Photochemistry

MO 11.2: Poster

Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof

Investigation of the transient absorption of the adsorbate in contact with different metallic surfaces — •Alireza Mazaheri Tehrani, Faezeh Mohaghegh, and Arnulf Materny — Physics and Earth Sciences, Jacobs University Bremen, Campus Ring 1, 28759 Bremen

The interactions of molecules adsorbed on metal surfaces with surface plasmon polaritons are of great importance for spectroscopic applications, such as surface enhanced Raman spectroscopy (SERS). So far, experimental SERS investigations have mostly been performed in the frequency domain using continuous wave lasers. This way, although the results are quite interesting concerning applications, they mostly fail to nicely address the underlying physical concepts and mechanisms of SERS. Time-resolved experiments, however, would help us to gain a better understanding of the underlaying energy transfer mechanisms involved in surface enhanced spectroscopy due to different time scale characteristics of the adsorbate in various configurations. In this work we investigate the transient absorption of the adsorbate in contact with different metallic surfaces. Surface plasmons polaritons are excited with a femtosecond laser pulse (Pump) adjusted to the ground state absorption. Dynamic information of the system can then be probed by another time-delayed femtosecond laser pulse, which can freely be adjusted to other excited states of adsorbates or to the ground state absorption. This experiment provides us with a much deeper insight into the energy transfer mechanisms between SPPs and molecules.