Hannover 2020 – scientific programme

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MO: Fachverband Molekülphysik

MO 14: Vibrational and Rotational Spectroscopy

MO 14.7: Talk

Wednesday, March 11, 2020, 16:00–16:15, f142

IR/UV Ion Dip Spectroscopy of the 2-Methyl-Allyl-Radical and its High Temperature Bimolecular Reaction Products — •Tobias Preitschopf¹, Florian Hirsch¹, Alexander Lemmens², Anouk M. Rijs², and Ingo Fischer¹ — ¹Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — ²FELIX Laboratory, Faculty of Science, Radboud University, Toernooiveld 7, 6525 ED Nijmegen, The Netherlands

As recent studies suggest, small hydrocarbon radicals such as the 2-methyl-allyl radical (2-MAR) are considered as highly reactive intermediates in combustion processes [1]. Studies of these isolated radicals are scarce but bear important information on their reactions for kinetic modelling of combustion processes.

In this work we investigate the gas phase IR-spectra of the 2-MAR and its high temperature bimolecular reaction products in a free jet using IR/UV Ion-Dip-Spectroscopy. This double resonance spectroscopic method combines the structural sensitivity of mid-infrared spectroscopy with mass information from UV photoionization. The 2-MAR is generated by flash pyrolysis from the corresponding bromide precursor. Additionally, the pyrolysis-tube serves as a flow reactor to foster bimolecular reactions. While a dye-laser ionizes the various products in a one-color two-photon process, the mid-IR-radiation is provided by the free electron laser FELIX, Nijmegen/NL. This intense IR light source can be scanned over the fingerprint region for unambiguous identification of the dilute reaction products.

[1] V. D. Knyazev et al., J. Phys. Chem. A. 1998, 102, 8932-8940