|Message: Re: Mie scattering cross section||Not Logged In (login)|
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Please, see the Physics Reference Manual:
(sections 3.2.1 and 3.2.2) for how the mean free path and cross section are related and how the defined distance (step) to the next interaction is sampled in a Monte Carlo method from the given mean free path (or cross section).
What is provided, either calculated internally by the code, or from a data base, or via the methods for optical Mie and Rayleigh scattering, is the average/mean/expectation-value of the distance a particle will travel before undergoing said interacation.