Berlin 2005 – wissenschaftliches Programm
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MO: Molekülphysik
MO 31: Ultrafast Photochemistry
MO 31.3: Vortrag
Montag, 7. März 2005, 11:00–11:15, HU 2091
Excited-State Decay of Ethyl and Propargyl Radical, investigated by Femtosecond Time-Resolved Photoionization — •Matthias Zierhut1, Bastian Noller1, Ingo Fischer1, and Thomas Schultz2 — 1Institute of Physical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg — 2Max-Born-Institute, Max-Born-Straße 2a, D-10247 Berlin
The excited state decay of the hydrocarbon radicals ethyl, C2H5, and propargyl, C3H3, was investigated by femtosecond time-resolved photoionisation. Radicals were generated by flash pyrolysis of n-propyl nitrite and propargyl bromide, respectively. It is shown that the 2 2A′ (3s) Rydberg state of ethyl around 250 nm decays with a time constant of 20 fs. No residual signal was observed at longer delay times. For the 3 2B1 state of propargyl a somewhat slower decay with a time constant between 40 and 60 fs was determined.