DAFS - Universidad de Zaragoza

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$Difracción de Rayos X, neutrones y electrones$

Grazing inci<strong>de</strong>nce diffraction [110] 1 1 o Λ = = ≈190 A δQ Q tanδω - Intensity E = 11.867 keV, ID1, ESRF (4-40) InP substrat scan Q ⊥ (Å -1 ) • Diffraction with the polarization ⊥ to the surface •scan Q ⊥ : short range correlations, shape • radial scan Qr ([1-10]) : perfect pseudomorphy 22/50
Grazing inci<strong>de</strong>nce diffraction BM2-D2AM-ESRF In-plane scattering Spatial selectivity [110] Intensité (unité arb.) Intensity 10 5 10 4 Correlation statellite -1 QWrs substrat InP (440) InP (440) substrat InAs bulk 1/d=0.93 0.94 0.95 0.96 0.97 0.98 q=2sin(θ)/λ (Å -1 ) radial scan : Qr=1/d (Å -1 ) •a InAs=0.60584nm (1/d 440=0.934 Å -1) ; a InP=0.58686nm (1/d 440=0.964 Å -1) • Diffraction in the vertical plane : polarization ⊥ to the surface • Radial scan : strain, correlation, shape and composition sensitive 23/50
Page 1 and 2: Universidad de Zaragoza Curso de Ma
Page 3 and 4: TÉCNICAS EXPERIMENTALES µ I diff
Page 5 and 6: EL DAFS El DAFS es la estructura fi
Page 7 and 8: Resonant atomic scattering factor f
Page 9 and 10: y 0 Structure factor: Multi-wavelen
Page 11 and 12: I F diff 0 F 0 Análisis de datos D
Page 13 and 14: Using the path formalism for descri
Page 15 and 16: Spatial selectivity : GaAs xP 1-x/G
Page 17 and 18: TEM InAs/InP QWrs AFM 200nm GaN/AlN
Page 19 and 20: Local structure study of InAs/InP Q
Page 21: As-O As K-edge EXAFS (BM8-ESRF) Int
Page 25 and 26: GI-DAFS (Grazing Incidence DAFS) k(
Page 27 and 28: Diffraction Intensity (a.u.) GIDAFS
Page 29 and 30: Abs II EXAFS and EDAFS best fit res
Page 31 and 32: GIDAFS oscillations analysis CP1276
Page 33 and 34: EXAFS (ε // & ε ⊥) Similar resu
Page 35 and 36: Applications : Nanostructures III-V
Page 37 and 38: Applications : Nanostructures III-V
Page 39 and 40: BQ GaN/AlN 10ML : EXAFS vs DAFS k
Page 41 and 42: BQ GaN/AlN : EDAFS simulations h=2.
Page 43 and 44: Orden de carga y reflexiones prohib
Page 45 and 46: Estado electrónico de los sitios o
Page 47 and 48: Anisotropía del factor de dispersi
Page 49 and 50: Zona del umbral (DANES) Modelo refl
Page 51 and 52: Prepico Cálculos “ab initio” d
Page 53: Grazing Incidence Diffraction Anoma

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