DAFS - Universidad de Zaragoza
DAFS - Universidad de Zaragoza DAFS - Universidad de Zaragoza
Las oscilaciones que se observan por encima del umbral dependen de la parte oscilatoria del factor de dispersión Se puede obtener una información de tipo electrónico y estructural análoga a la que se obtiene del XAFS r " f µ ( Q = 0, E) ∝ E ( E) " f ⇐ Kramers − Kronig ⇒ f f ' " 2 = P π 2ω = P π ∞ ' " ω f ∫ '2 0 ω − ∞ ' ω ∫ 0 ' ( ω ) d '2 ω ' f '( ω ) d '2 '2 ω −ω ' ω Teorema óptico f ' ω ' Causalidad (InP) 3 (GaP) 2 /GaAs K-Ga (006) I (a.u.) DAFS f" 10.2 10.4 10.6 10.8 E (Kev) f'
y 0 Structure factor: Multi-wavelenght Anomalous Diffraction (MAD) F A x N iQ. rj i FQE ( , ) f j ( QEe , ) Fe φ r r r r = ∑ = j= 1 r I ( Q , E ) ∝ FF |F A | : Thomson scattering of all resonant atoms ; |F N | : scattering of 0 ' '' all non resonant atoms ; f f + if ( E : resonant scattering F T = F A + F N [ ( ) ] ) F A A A A *
- 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: Resonant atomic scattering factor f
- 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 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
y<br />
0<br />
Structure factor:<br />
Multi-wavelenght Anomalous Diffraction (MAD)<br />
F A<br />
x<br />
N<br />
iQ. rj i<br />
FQE ( , ) f j ( QEe , ) Fe φ<br />
r r r r<br />
= ∑<br />
=<br />
j=<br />
1<br />
r<br />
I ( Q , E ) ∝ FF<br />
|F A | : Thomson scattering of all resonant atoms ; |F N | : scattering of<br />
0 ' ''<br />
all non resonant atoms ; f f +<br />
if ( E : resonant scattering<br />
F T = F A + F N<br />
[ ( ) ] )<br />
F A A A A<br />
*
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