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Department of Synchrotron Radiation Research Lund University sljus.lu.se

Department of Synchrotron Radiation Research Lund University http://www.sljus.lu.se. Lund Thousand year old Danish foundation Swedish since 1658. Lund University Founded in 1666 Today 40,000 students. The Department of Synchrotron Radiation Research.

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Department of Synchrotron Radiation Research Lund University sljus.lu.se

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  1. Department of Synchrotron Radiation Research Lund University http://www.sljus.lu.se

  2. Lund Thousand year old Danish foundation Swedish since 1658

  3. Lund University Founded in 1666 Today 40,000 students

  4. 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

  5. Swedish national synchrotron radiation facility MAX-lab

  6. What kind of information can we obtain?

  7. Geometric information I: Scanning tunnelling microscopy

  8. Geometric information II: X-ray/electron diffraction O/Ag(111) – p(4x4) Schmid et al., PRL 96 (2006) 146102

  9. Geometric information III: Photoelectron spectroscopy Ethylidyne (CH3CH) on Rh(111) Normal emission The photoelectron diffraction shows that the molecule stands upright on the surface!

  10. Geometric information IV: X-ray absorption spectroscopy The absorption intensity depends on the orientation of the orbitals! Dipole approximation: Dl=1, e.g. 1s -> xp

  11. Multichannel plate YAG-screen Objective lens Intermediate lens Projective lens Sample on manipulator Sample at -5 to -30 kV CCD camera Image plane Field aperture Intermediate image plane Stigmator, deflector PEEM pictures ofpentacene on Si Contrast aperture • Photons / Electrons • Synchrotron radiation (XPEEM) • UV lamp • Mercury lamp, etc • Electron gun 1 layer 2 layers 3 layers Geometric information V: LEEM/PEEM

  12. Chemical information I: PES From http://www-group.slac.stanford.edu/sms/xrayspectroscopy.html

  13. Chemical information II: PES Rh(553) without and with oxygen

  14. Electronic information: PES, XAS, STS C60 / Al(111) Johansson et al., PRB 54 (1996) 13472

  15. Reaction studies: PES Reduction of oxygen overlayers on Rh(111) by CO 2x1 Chemisorbed O 9x9 Oxide

  16. Electron femtosecond dynamics: RPES

  17. Future plans I Instrument development: 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

  18. 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 TiO2

  19. 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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