Workshop Sfb 546, Schmöckwitz, 15./ Sfb 546 "Übergangsmetalloxid-Aggregate"
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1 Workshop Sfb 546, Schmöckwitz, 15./
2 SFB 546 Struktur, Dynamik und Reaktivität von Übergangsmetalloxid-Aggregaten Teilprojekt C11 Untersuchung der Eigenschaften von Übergangsmetalloxid-Oberflächen mittels streifender Ionen-Streuung H. Winter, D. Blauth, M. Busch, J. Lienemann, K. Maass, R. Mitdank, A. Schüller, J. Seifert, S. Wethekam Institut für Physik der Humboldt-Universität zu Berlin Physik der Grenzflächen und dünnen Schichten UP1: Structure of Monolayer Silica Films on Mo(112) Teilprojekt B1 Teilprojekt C5 UP2: Investigation of SBA15 via Rutherford Backscattering (RBS) and NEXAFS (Mitdank) UP3: Structure of Titania Films on Mo(112) Teilprojekt B7
3 Struktur von Mo(112)/SiO: Goodman vs Sfb546 Goodman et al. [SiO 4 ] cluster model Teilprojekt B1 Sierka et al. 2D-network model Teilprojekt C5 M. Chen, A.K. Santra and D.W. Goodman, Phys. Rev. B 69 (2004) M. Chen and D.W. Goodman, Surf. Sci. 600 (2006) L255 siehe auch: Finanzierungsantrag T.K. Todorova et al., Phys. Rev. B 73 (2006) J. Weissenrieder et al., Phys. Rev. Lett. 95 (2005) M. Sierka et al., Chem. Phys. Lett. 424 (2006) 115
4 SiO on Mo(112) well defined ML-film LEED shows c(2x2)
5 Anzahl emittierter Elektronen Detektor auf Hochspannung kv kev H,! in = Cu(001) counts random <21> <11> <10> 2000 Aumayr et al. Appl. Surf. Sci. 47 (1991) 139 ( Vienna detector ) pulse height - Selektion kleiner n e : extreme Sensitivität auf oberste Lage - sehr kleine Ströme (sub-fa): Keine Schädigung der Probe - Methode auch anwendbar für Isolatoren - effíziente Normierung der Daten auf Gesamtsignal
6 Teilprojekt B1 Teilprojekt C5 Struktur von Mo(112) / SiO normalized electron signal simulation 2D network 0.4 H o 25 kev! in = azimuthal angle (deg)
7 Teilprojekt B1 Teilprojekt C5 Struktur von Mo(112) / SiO normalized electron signal simulation 2D network simulation with SiO 4 units 0.4 H o 25 kev! in = azimuthal angle (deg)
8 Structure of Mo(112)/SiO: 2D network vs. SiO 4 units
9 Workshop Sfb 546, Schmöckwitz, 15./ sketch of the experiment position sensitive channelplate detector target 25keV Ar 0 A(111) ϕ in =1,6 atomic beam (no image charge) E z = E 0 sin 2 φ in φ in = 0,5-2,5 E 0 = 1keV - 100keV E z = 1eV - 100eVD
10 (classical) rainbow scattering from Mo(112)/SiO under axial surface channeling conditions
11 Workshop Sfb 546, Schmöckwitz, 15./ trajectories and angular distributions 2 kev He o Mo(112)/SiO 2 Φ in = 1.5
12 Workshop Sfb 546, Schmöckwitz, 15./ trajectories and angular distributions 2 kev He o Mo(112)/SiO 2 Φ in = 1.5
13 (classical) rainbow scattering from Mo(112)/SiO under axial surface channeling conditions
14 Fast Atom Diffraction (FAD) during scattering from Mo(112)/SiO under axial surface channeling conditions
15 Fast Atom Diffraction (FAD) during scattering from Mo(112)/SiO under axial surface channeling conditions
16 Mo(112)/SiO 2 : splittings of Bragg peaks 3 He, 4 He d Mo = 4.46 Å d Mo = 2.73 Å d Mo = 2.33 Å d Mo = 1.73 Å d SiO = 4.46 Å d SiO = 2.73 Å d SiO = 4.66 Å d SiO = 1.73 Å (4.54 ± 0.08) Å (2.74 ± 0.08) Å (4.82 ± 0.05) Å (1.76 ± 0.06) Å
17 Fast Atom Diffraction (FAD) during scattering from Mo(112)/SiO under axial surface channeling conditions
18 Fast Atom Diffraction (FAD) during scattering from Mo(112)/SiO under axial surface channeling conditions
19 Fast Atom Diffraction (FAD) during scattering from Mo(112)/SiO under axial surface channeling conditions interaction potential from DFT calculations (Wlodarczyk, Sierka)
20 Fast Atom Diffraction (FAD) during scattering from Mo(112)/SiO under axial surface channeling conditions interaction potential from DFT calculations (Wlodarczyk, Sierka)
21 Structure of Mo(112)/SiO: 2D network vs. SiO 4 units
22 c(2x4)tio/mo(112) - growth of 2ML titanium at 1050K in 2*10-7 mbar oxygen atmosphere on oxygen covered Mo(112) - annealing for 5min at 1300K ion beam triangulation (IBT) with 25 kev H atoms 100eV
![atoms [10]](/docs-images/89/98839855/images/23-3.jpg "[32] [11]")
23 fast atom diffraction (FAD) with 1.5 kev He atoms [10] [32] [11] [12] [01]
24 Publikationen TP C11 Unterprojekt 1 H. Winter, J. Seifert, D. Blauth, M. Busch, A. Schüller, S. Wethekam Structure of ultrathin oxide layers on metal surfaces from grazing scattering of fast atoms Applied Surface Science 256 (2009) 365 J. Seifert, D. Blauth, H. Winter Evidence for 2D-network structure for monolayer silica film on Mo(112) Physical Review Letters 103 (2009) J. Seifert, H. Winter Structure of monolayer silica film on Mo(112) investigated by rainbow scattering under axial surface channeling Surface Science Letters 603 (2009) L109 J. Seifert, M. Busch, A. Schüller, D. Blauth, S. Wethekam, H. Winter Structure of ultrathin silica films on Mo(112) studies via classical and quantum mechanical rainbow scattering of fast atoms Surface and interface analysis (2010) submitted J. Seifert, A. Schüller, H. Winter, R. Wlodarczyk, M. Sierka, J. Sauer Fast atom diffraction during scattering from a monolayer silica film on Mo(112) Physical Review B (2010) to be submitted
25
26 structure of Mo(112)/SiO 2 : cluster vs. 2D-network Goodman et al. [SiO 4 ] cluster model Sierka et al. 2D-network model M. Chen, A.K. Santra and D.W. Goodman, Phys. Rev. B 69 (2004) M. Chen and D.W. Goodman, Surf. Sci. 600 (2006) L255 T.K. Todorova et al., Phys. Rev. B 73 (2006) J. Weissenrieder et al., Phys. Rev. Lett. 95 (2005) M. Sierka et al., Chem. Phys. Lett. 424 (2006) 115
27 Structure of Mo(112)/SiO 2 : cluster vs. 2D network
28 SiO on Mo(112) well defined ML-film LEED shows c(2x2)
29 Mo(112)/SiO 2 : diffraction charts experiment 2D-network model DFT-calculations: Sierka et al. (2009)
30 Mo(112)/SiO 2 : diffraction charts 2D-network model cluster model
31 Structure of Mo(112)/SiO: 2D network vs. SiO 4 units
32 rainbow scattering and diffraction (corrugation) can be much smaller than lattice constant
33 supernumerary rainbows
34 insulators metals semi conductors LiF(100) NaCl(100) Rousseau MgO(100) Ni(110) Rousseau, Khemliche, Roncin GaAs(001) ZnSe(001) superstructures reconstruction thin films c(2x2)o/fe(110) c(12x16)s/fe(110) c(1x3)s/fe(110) p(1x2)o/ni(110) p(1x2)o/mo(112) J. Seifert p(1x3)o/ni(110) J. Seifert SiO/Mo(112)
35 Stellung innerhalb des Sfb546 Teilprojekt B1 Teilprojekt C5 structure of Mo(112) / O and Mo(112) / SiO Teilprojekt C1 titania films on metal substrates coadsorption V Ti (complementary methods) Teilprojekt C4 bulk vanadia crystals Teilprojekt C8 TiO 2 surfaces (complementary methods) low energy ion scattering
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