Dresden 2017 – scientific programme

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O: Fachverband Oberflächenphysik

O 90: Surface Dynamics: Experiments

O 90.7: Talk

Thursday, March 23, 2017, 12:00–12:15, WIL C107

Photodesorption of CO from Si(100) — •Michael Lackner, Daniel Lucaßen, and Eckart Hasselbrink — Universität Duisburg-Essen, Fakultät für Chemie, 45141 Essen

Velocity distributions of photodesorbed molecules can provide substantial insights into the desorption dynamics.

CO adsorbed on Si(100) is desorbed by a pulsed UV laser (266/355 nm). Time of flight spectra of these desorbed CO molecules are measured with a mass spectrometer, yielding velocity distributions. We observe at least two desorption channels. The yield in these solely depends on photon wavelength.

Furthermore cross sections were determined by a similar measurement setup. Here, the total signal decays double exponentially and depends on photon exposure.