Hannover 2016 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 1: Quantum Control and Femtosecond Spectroscopy 1
MO 1.5: Vortrag
Montag, 29. Februar 2016, 12:00–12:15, f102
Femtosecond dynamics of isolated radicals in the gas phase — •Anja Roeder1, Lionel Poisson2, and Ingo Fischer1 — 1iversity of Wuerzburg, Am Hubland Süd 97074 Wuerzburg, Germany — 2EA, Laboratoire Francis Perrin-Bât 522 91191 Gif-sur-Yvette, France
Radicals are important intermediates in combustion processes and in the formation of polyaromatic hydrocarbons (PAHs), a precursor to soot. The benzyl radicals were produced from nitrite precursors via pyrolysis and subsequently expanded in a molecular beam. Using femtosecond pump-probe spectroscopy the lifetimes of their excited states were examined via photoelectron spectroscopy and mass spectroscopy. The benzyl radical was excited in the D5 state using 266 nm and ionized with either a 800 nm or the BBO-doubled 400 nm probe pulse. The dynamics of the D5-state was examined using time-resolved mass spectra and time-resolved photoelectron spectra. The results obtained can be understood in framework of the calculations performed by the group of R. Mitric (Wuerzburg), in which the initial populated D5 state decays quickly via the D4 to the D3 state (short time constant), which decays more slowly to the D1 state (long time constant).
Acknowledgements: Roland Mitric