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Summary: what you must know about scattering

Summary: what you must know about scattering. . A plane wave:. Phase fronts (planes of equal phase). Point scatter:. Scattering vector. Point scatters:. Continuous medium:. Form factor scattering. Independent scatterers:. Form factor scattering An example: a uniform sphere. .

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Summary: what you must know about scattering

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  1. Summary: what you must know about scattering

  2. A plane wave: Phase fronts (planes of equal phase)

  3. Point scatter: Scattering vector

  4. Point scatters:

  5. Continuous medium:

  6. Form factor scattering Independent scatterers:

  7. Form factor scatteringAn example: a uniform sphere

  8. Form factor scatteringAn example: a uniform sphere In reality: 

  9. Form factor scatteringAn example: a uniform sphere Guinier range: I(K)  exp(-RgK)2/3) LOG-LOG plot:  Porod range: I(K)  A/K4 total surface area

  10. 2p/d experimental Form Factor 4 orders of magnitude variation Dangerous region

  11. ‘1D object’ orientational average ‘2D object’ Form factor scatteringMore examples: disks & rods

  12. Form factor scatteringMore examples: Dumbbells R = 95 nm Johnson et al. (Utrecht); published in Langmuir (2005)

  13. SANS: structure factor effect in dipolar chains M. Klokkenburg et al., to be published.

  14. Most popular techniques • Small-angle x-ray scattering (SAXS) • Small-angle neutron scattering (SANS) • Light scattering See slides of the other lecture

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