Stuttgart 2012 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 2: Electronic Spectroscopy
MO 2.1: Vortrag
Montag, 12. März 2012, 10:30–10:45, V38.02
Photoionisation of the C3H2 isomer Propargylene — •Michael Steinbauer1, Melanie Lang1, Ingo Fischer1, Bárbara K. Cunha de Miranda2, Claire Romanzin2, and Christian Alcaraz2 — 1Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany — 2Laboratoire de Chimie Physique, Bât 350, UMR 8000 CNRS & Université Paris-Sud 11, F-91405 Orsay, France
Our group examines the structure and dynamic of reactive intermediates like radicals and carbenes in the gas phase. These species play an important role in the formation of soot in combustion processes or in the chemistry of interstellar space.
Synchrotron radiation as a tunable light source along with Threshold Photoelectron Photoion Coincidence (TPEPICO) spectroscopy can be used to determine ionization energies (IE) of such molecules. As example the threshold photoelectron spectrum of the transient species propargylene, one of three C3H2 isomers, is presented. The challenge in these experiments is the handling of the precursor, diazopropargylene. This precursor has to be synthesized in advance for every measurement, is explosive and therefore difficult to handle. However we were able to determine the IE of propargylene and of its precursor. Also the dissoziative photoionization of the precursor has been evaluated.
In the talk these results will be presented and compared to the other isomers.