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Stuttgart 2012 – scientific programme

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MO: Fachverband Molekülphysik

MO 21: Poster 3: Cluster, Collisions, Energy Transfer, Photochemistry, Spectroscopy in He-Droplets

MO 21.23: Poster

Thursday, March 15, 2012, 16:30–19:00, Poster.IV

High Resolution IR Spectroscopy of Benzene Monomer and Dimer at Ultracold Temperature — •Sarah Grün, Torsten Poerschke, and Daniel Habig — Ruhr-University Bochum, Bochum, Germany

π⋯π and CH⋯π interactions are of special interest concerning stabilization mechanisms in DNA or proteins. Therefore, benzene, as the smallest aromatic molecule, and its dimer was used as a model and starting point for theoretical and experimental studies in the last decades. Our measurements were carried out using a high power cw-IR-OPO in combination with a helium nanodroplet spectrometer. We obtained IR spectra of benzene and benzene dimer in the C-H-stretching region of 3000-3110 cm−1. From the pressure dependence of IR-spectra, we assigned benzene monomer as well as dimer bands. The latter, we assigned to the tilted T-shaped (TTS) structure based on comparative treatment of the experimental results with theoretical predictions as well as gas phase studies from other groups. Parallel-displaced (PD) and perfect T-shaped (PTS) structure were not observed in this frequency region. In addition, we found a splitting of the ν819 combination band for benzene monomer, which was not splitting in gas phase matrices. This can be explained with an additional Fermi resonance coming from the helium matrix.

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