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Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 62: Posters: Surface Reactions and Dynamics, Nanostructures

O 62.15: Poster

Mittwoch, 2. April 2014, 17:30–21:00, P1

Femtosecond time-resolved two-photon photoemission spectroscopy of C6H5F/Cu(111) — •Ishita Agarwal, Isabella Avigo, Manuel Ligges, Ping Zhou, and Uwe Bovensiepen — Faculty of Physics, University of Duisburg-Essen, Duisburg

The electron dynamics at a metal-organic interface is studied with two-photon photoemission (2PPE) spectroscopy. We report here binding energies, band dispersion, and lifetimes of unoccupied metal-molecular interface states for up to 3 monolayers (ML) of mono-fluorobenzene (C6H5F) adsorbed on Cu(111). For all coverages, an unoccupied electronic state with a binding energy of 3.67±0.05 eV above the Fermi level (EF) was found. In addition, between 1 and 2 ML, a second unoccupied feature with a binding energy of 3.54±0.05 eV above EF was observed. Using angle-resolved spectroscopy the band dispersion of these unoccupied states was studied and an effective mass of (0.76±0.20)×me and (0.8±0.2)×me was found, respectively. Time-resolved 2PPE measurements indicate an ultrashort lifetime of about 10 fs. Overall, the observations resemble previous coverage dependent 2PPE studies of C6F6/Cu(111)[1] and C6H6/Cu(111)[2] which suggest a structural influence on the unoccupied electronic structure at the interface. Funding by the DFG through BO1823/5-1 is gratefully acknowledged.
 D.Velic, et al., J. Chem. Phys., 109, 9155, (1998)
 C.Gahl, et al., Faraday Discuss., 117, 191, (2001)

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