Dresden 2011 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 34: Photochemistry
MO 34.8: Vortrag
Freitag, 18. März 2011, 12:15–12:30, TOE 317
Photoionization of Reactive Intermediates — •Michael Steinbauer1, Patrick Hemberger1, Ingo Fischer1, and Andras Bödi2 — 1Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 2Molecular Dynamics Group, Paul-Scherrer-Institut, 5232 Villigen, Switzerland
Our group examines the dynamic of reactive intermediates in the gas phase. These radicals play an important role in the formation of soot in combustion processes, polycyclic aromatic hydrocarbons (PAHs) or in the chemistry of Earth’s atmosphere. Ionization energies (IE) can be used as a kind of fingerprint for identification in flames if the latter is known in advance. Dissoziative Photoionization (DPI) can be used to determine binding energies in the radicals instead.
Synchrotron radiation as a tunable light source along with Threshold Photoelectron Photoion Coincidence (TPEPICO) spectroscopy can be used for this purpose. As example the threshold photoelectron spectra of the transient species bromomethyl radical CH2Br and the fulvenallenylradical C7H5 are presented in this talk. For the second very little is known, thus the IE can be used for detection in flames for example. For CH2Br the DPI was examined and a breakdown diagram could be recorded. Out of a thermocycle the C-Br binding energy could be determined.