AVS 57th International Symposium & Exhibition
    Surface Science Wednesday Sessions
       Session SS2-WeM

Paper SS2-WeM9
Methyl Radical Velocity Distributions from Ketone Photooxidation on TiO2(110)

Wednesday, October 20, 2010, 10:40 am, Room Santa Ana

Session: Electron, Photon and Ion Beam Induced Surface Modification
Presenter: D. Wilson, Stony Brook University
Authors: D. Wilson, Stony Brook University
M. White, Stony Brook University
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The velocity distributions of methyl radical desorption from a photoinduced reaction of three ketones (acetaldehyde, acetone, and acetophenone (coadsorbed with O2)) on TiO2(110) was studied to determine the mechanism of reaction for these model systems. The data was collected using a pump-probe Time-of-Flight (TOF) method. The firing delay time between pump(initiates surface chemistry) and probe(ionizes desorbing neutrals) can be varied over a wide time range to map the velocities of the desorbing methyl species. Excitation occurs using 3.7 eV photons followed by ionization using 13.05 eV photons. Differences in the velocity distributions are observed and potential explanations of these differences is explained.