Dresden 2009 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 64: Metal substrates: Adsorption of inorganic molecules

O 64.1: Vortrag

Freitag, 27. März 2009, 11:15–11:30, SCH A215

Angle Resolved Photoelectron Distribution of the 1π Resonance of CO/Pt(111) — •Thorben Haarlammert¹, Sebastian Wegner¹, Grigorius Tsilimis¹, Helmut Zacharias¹ und Alexander Golovin² — ¹Physikalisches Institut, Westfälische Wilhelms Universität, Münster — ²Institute of Physics, St. Petersburg State University

The CO 1π level of a c(4x2)-2CO / Pt(111) reconstruction shows a significant resonance when varying the photon energy between hν=23 eV and hν=48 eV. This resonance has not been observed in gas phase measurements or on the Pt(110) surface. To investigate the photoelectron distribution of the 1π level High Harmonic Radiaton has been used. By conversion in rare gases like Argon, Neon, or Helium photon energies of up to 100 eV have been generated at repetition rates of up to 10 kHz. The single Harmonics have been separated and focused by a toroidal grating and directed to the sample surface. A time-of-flight detector with multiple anodes registers the kinetic energies of the emitted photoelectrons and enables the simultaneous detection of multiple emission angles.

The angular distributions of photoelectrons emitted from the CO 1π level have been measured for a variety of initial photon energies. Further the angular distributions of the CO 1π level photoelectrons emitted from a CO-Pt₇ cluster have been calculated using the MSXα-Method which shows good agreement with the experimental data.