Hannover 2016 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 19: Posters 4: Novelties in Molecular Physics: Femtosecond Spectroscopy, Molecular Clusters, Cold Molecules and Helium Droplets

MO 19.9: Poster

Donnerstag, 3. März 2016, 16:30–19:00, Empore Lichthof

Effect of alkyl chain length on the ultrafast vibrational dynamics of C-H stretching in 1-alkyl-3methylimidazolium ionic liquids — Mehdi M. Kazemi, Mahesh Namboodiri, Johannes Kiefer, and •Arnulf Materny — Physics and Earth Sciences, Jacobs University Bremen, Campus Ring 1, 28759 Bremen

Femtosecond time-resolved coherent anti-Stokes Raman scattering (fs-CARS) is used to study the ultrafast vibrational dynamics in ionic liquids (ILs). The effect of increasing the alkyl chain length, n, in 1-alkyl-3methylimidazolium bis-(trifkuromethansulfonyl)imid (CnC1ImTSFI n=6,8,10,12) ionic liquid on the vibrational dynamics of C-H stretching is studied. The high frequency C-H stretching modes 2800-3000 cm⁻¹ are excited and probed by the fs-CARS excitation around 3000 cm⁻¹. The results show that the vibrational dynamics of the ILs depends more on the viscosity than the hydrogen bonding as the alkyl chain length increases.