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 11.12: Poster

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

Study of the self-reaction products of propargyl radicals via IR/UV ion-dip-spectroscopy — •Florian Hirsch¹, Philipp Constantinidis¹, Ingo Fischer¹, and Arghya Dey² — ¹Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany — ²Department of Molecular and Laser Physics, Institute for Molecules and Materials, Radboud University Nijmegen, 6525 AJ Nijmegen, Netherlands

The self-reaction products of propargyl radicals produced by flash pyrolysis have been studied by ion-dip-spectroscopy in a free jet. On the basis of the high stability of these radicals, it has been assumed for years that they might play an important role in the formation of polycyclic aromatic hydrocarbons (PAHs) and consequently soot.

The spectroscopic method utilized in this study is capable of providing mass selective infrared spectra, which can be used for unambiguous identification of the formed molecules. The radicals have been generated by flash pyrolysis from the bromide precursor and ionized at fixed wavelengths between 263 - 275 nm. A tunable free electron laser provided infrared radiation in the range of 550 - 1750 cm-1. Subsequent analysis of the differences in ion signals, with and without infrared excitation, resulted in the sought after infrared spectra. Eventually comparison with theoretical and experimental data was performed for identification of the various reaction products.

This poster will provide a fundamental overview of methodology and results of this study, executed at the Free Electron Laser for Infrared eXperiments (FELIX) (Nijmegen, Netherlands).