DAFS - Universidad de Zaragoza
DAFS - Universidad de Zaragoza DAFS - Universidad de Zaragoza
X-ray absorption at the As K-edge (EXAFS) P : next nearest neighbors In As/P In : first nearest neighbors contribution II I II Abs. I I Abs. II I χ(k) 0.05 0 -0.05 -0.1 3 5 7 9 11 13 15 k (Å -1 ) k(Å-1 ) résiduel 20/50
As-O As K-edge EXAFS (BM8-ESRF) Intensité Normalisée | FT(k 2 χ(k)) | 0.02 0.01 0 2 1.5 1 0.5 0.026 0.02 0.014 11860 11880 11900 11920 11940 11800 12000 12200 12400 12600 12800 Energie (eV) energy Radial distribution 0 0 1 2 3 4 5 R(Å) R(Å) χ(k) 0.08 0.04 0 -0.04 -0.08 EXAFS -0.12 2 4 6 8 10 12 14 k(Å -1 ) k(Å-1 ) absence of 2 cd shell ! Various As sites, needs of spatial selectivity résiduel 21/50
- 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: Local structure study of InAs/InP Q
- 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
X-ray absorption at the As K-edge (EXAFS)<br />
P : next nearest neighbors<br />
In As/P In : first nearest neighbors<br />
contribution<br />
II<br />
I<br />
II<br />
Abs.<br />
I<br />
I<br />
Abs.<br />
II<br />
I<br />
χ(k)<br />
0.05<br />
0<br />
-0.05<br />
-0.1<br />
3 5 7 9 11 13 15<br />
k (Å -1 )<br />
k(Å-1 )<br />
résiduel<br />
20/50
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