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MO: Fachverband Molekülphysik
MO 13: Probing Vibrations
MO 13.5: Talk
Thursday, March 9, 2017, 12:15–12:30, N 6
Study of the self-reaction products of benzyl radicals via IR/UV ion-dip-spectroscopy — •Florian Hirsch1, Philipp Constantinidis1, Ingo Fischer1, and Anouk M. Rijs2 — 1Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany — 2Institute for Molecules and Materials, Felix Laboratory, Radboud University, Toernooiveld 7c, 6525 ED Nijmegen, The Netherlands
The self-reaction products of benzyl radicals produced by flash pyro-lysis have been studied by ion-dip-spectroscopy in a free jet. Due to the high stability of this species and its great abundance in hot flames during combustion processes, these radicals might play an important role in the formation of polycyclic aromatic hydrocarbons (PAHs) and consequently soot. Because of the potential health and environmental impact of these undesired products, it is of significant importance to understand the basic mechanisms which lead to these molecules in hot flames.
The spectroscopic method utilized in this study is capable of provi-ding mass selective infrared spectra, which can be used for identification of the formed molecules. The radicals have been generated by flash pyrolysis from a nitrite precursor and ionized at fixed wavelengths at 265 or 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 for product identification.