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Department of Synchrotron Radiation Research Lund University http://www.sljus.lu.se
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Lund Thousand year old Danish foundation Swedish since 1658
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Lund University Founded in 1666 Today 40,000 students
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The Department of Synchrotron Radiation Research Division of the Institute of Physics Research staff: 3 professors, 1 associate professor, 3 assistant professors, 2 postdocs, 6 PhD-students Primary research subjects: Surface physics and chemistry (metal surfaces and their interaction with adsorbates, surface oxides, organic adsobates on metals and oxides), semiconductor nano- structures, molecular physics Primary experimental techniques: Electron (and ion) spectroscopy, scanning tunnelling microscopy and spectroscopy, low-energy electron and x-ray diffraction, photoemission and low-energy electron microscopy
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Swedish national synchrotron radiation facility MAX-lab
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What kind of information can we obtain?
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Geometric information I: Scanning tunnelling microscopy
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Geometric information II: X-ray/electron diffraction O/Ag(111) – p(4x4) Schmid et al., PRL 96 (2006) 146102
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Geometric information III: Photoelectron spectroscopy Ethylidyne (CH3CH) on Rh(111) The photoelectron diffraction shows that the molecule stands upright on the surface! Normal emission
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Geometric information IV: X-ray absorption spectroscopy Dipole approximation: l=1, e.g. 1s -> xp The absorption intensity depends on the orientation of the orbitals!
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Geometric information V: LEEM/PEEM Sample on manipulator Sample at -5 to -30 kV Objective lens Contrast aperture Field aperture Stigmator, deflector Intermediate lens Projective lens Multichannel plate YAG-screen CCD camera Image plane Intermediate image plane Photons / Electrons Synchrotron radiation (XPEEM) UV lamp Mercury lamp, etc Electron gun PEEM pictures of pentacene on Si 1 layer2 layers3 layers
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Chemical information I: PES From http://www-group.slac.stanford.edu/sms/xrayspectroscopy.html
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Chemical information II: PES Rh(553) without and with oxygen
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Electronic information: PES, XAS, STS C 60 / Al(111) Johansson et al., PRB 54 (1996) 13472
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Reaction studies: PES 2x1 Chemisorbed O 9x9 Oxide Reduction of oxygen overlayers on Rh(111) by CO
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Electron femtosecond dynamics: RPES
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Future plans I High-pressure x-ray photoelectron spectroscopy instrument at MAX-lab (clearly within MONET lifetime, 1 to 2 years from now): ultimate goal maximum pressure around 25 Torr (achievable?), in situ combination of UHV and high pressure experiment Instrument development:
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Future plans II Experiments in the near future: Comparitive STM study of large molecule deposition techniques: Nottingham spray deposition in situ passivation and ex situ molecule exchange in situ liquid droplet deposition using a pulse valve Deposition of carboxylated and non-carboxylated cyclodextrins Interaction of iron phthalocyanines/graphite with water (UHV) Organometallic architectures: L-cysteine and Au on TiO 2
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Future plans III Projecs in the long run Metal-nitrogen complex architectures and their interaction with gases In situ study of the interaction of organic molecules with water
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