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Cross-section and types of scattering

https://en.wikipedia.org/wiki/Cross_section_(physics)

dimensionality σ(cm)2

resonant scattering at high frequencies σ1ω2

Rayleigh scattering https://en.wikipedia.org/wiki/Rayleigh_scattering

σ1ω4

https://en.wikipedia.org/wiki/Raman_scattering