DAFS - Universidad de Zaragoza

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$Difracción de Rayos X, neutrones y electrones$

DAFS spectroscopy To measure anomalous diffraction (diffuse scattering) intensity - as a function of the x-ray beam energy (energy step of about 1eV) - at fixed scattering vector - over a 1000eV range with a high S/N ratio (at least 10 3 ) monochromator Monochromatic SR experiment mirror mirror slits DAFS @ BM2-ESRF H. Renevier et al., J. Synch. Rad. 10, (2003), 435 slits • 7-circle diffractometer • Diffraction : vertical/ horizontal planes • Polarisation analysis
Spatial selectivity : GaAs xP 1-x/GaAs epilayer (x≈0.20) DAFS : to investigate the strain accomodation in the strained epilayer θ 1 ≠ θ 2 θ 1 RX I(E) GaAsP θ2 Tensile in plane strain GaAs [100] • Chemical selectivity ε = (aGaAsP-aGaAs)/aGaAs • Spatial selectivity, •The x-rays probe the entire thickness of the epilayer • The data analysis is easy (one site) as well as the experiment M.G. Proietti, H. Renevier et al., Phys. Rev. B 59, (1999), 5479. 15/50
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: Using the path formalism for descri
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 and 22: As-O As K-edge EXAFS (BM8-ESRF) Int
Page 23 and 24: Grazing incidence diffraction BM2-D
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

DAFS - Universidad de Zaragoza

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