# Summary: what you must know about scattering - PowerPoint PPT Presentation

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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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### A plane wave:

Phase fronts (planes of equal phase)

### Point scatter:

Scattering vector

### Form factor scattering

Independent scatterers:

In reality:

### 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

2p/d

### experimental Form Factor

4 orders of magnitude variation

Dangerous region

‘1D object’

orientational average

‘2D object’

### Form factor scatteringMore examples: Dumbbells

R = 95 nm

Johnson et al. (Utrecht); published in Langmuir (2005)

• SANS: structure factor effect in dipolar chains

M. Klokkenburg et al.,

to be published.

### Most popular techniques

• Small-angle x-ray scattering (SAXS)

• Small-angle neutron scattering (SANS)

• Light scattering

See slides of the other lecture