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Hannover 2010 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 16: Electronic Spectroscopy II

MO 16.3: Vortrag

Mittwoch, 10. März 2010, 17:15–17:30, F 102

REMPI spectroscopy of the benzyl radical — •Markus Margraf1, Bastian Noller1, Thomas Schultz2, and Ingo Fischer11Institute of Physical and Theoretical Chemistry, University of Würzburg, Germany — 2Max Born Institute Berlin, Germany

Radicals, especially aromatic radicals play an important role in combustion chemistry. We investigated the benzyl radical by [1+1]-REMPI spectroscopy in the range of 32000 to 34500 cm-1. Toluene and 2-phenyl ethyl nitrite showed to be appropriate precursors. The results of the REMPI spectrum are in good agreement with earlier absorption measurements in a cell. The nanosecond-data aid in the interpretation of femtosecond time-resolved pump probe experiments of the benzyl radical. In these experiments the dynamic of benzyl radical was investigated in a free jet. On the one hand we studied the dependence on pump wavelength (298 nm, 301 nm, 305 nm) at constant probe wavelength of 800 nm at all experiments and on the other hand we used different precursors for generating the benzyl radical. In all cases we observe a biexponential decay. The life times increased with pump wavelength.

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