where Si and S2 are called the Mie scattering functions (§6.3.2).

The time-average magnitude of the Poynting vector of the scattered wave can be written as r = <«•:»>

The total rate of scattered energy, dL (in W), flowing through an element of area dA is then dL = P • ndA, (6.32)

where n is a unit vector normal to the element of surface. If we now replace dA/r2 by d^ = sin OdOd0, an element of solid angle, then the total rate of energy, L, scattered into a sphere around the scattering particle is

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