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Summary

DescriptionXsection2.png	This figure plots equivalent quantities used in the theory of scattering from composite specimens, but with a variety of units, onto a single plot. The grey dots are for inelastic scattering of a 300 keV electron passing through a specimen of solid Silicon, as well as for an electron near its most strongly interacting energy of around 70 eV in a metal. The gold dot shows how a 300 keV electron has a shorter distance mean free path but about the same area cross-section. The mean free path between collisions of nitrogen molecules in air at STP is shown by the darker blue-green dot, while the cyan dot shows approximately where the mean free path for light scattering by fog might plot. The black and yellow dots denote nuclear cross-sections, e.g. in the latter case for Rutherford backscattering of a He nucleus from a gold foil.
Date	27 February 2008
Source	Own work
Author	P. Fraundorf

Licensing

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File history

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	Date/Time	Dimensions	User	Comment
current	16:12, 27 February 2008	354 × 332 (15 KB)	Papa November	rm opaque bg & cropped with GIMP. No copyright claimed for non-creative derivative work
	15:57, 27 February 2008	360 × 336 (15 KB)	Unitsphere
	15:42, 27 February 2008	283 × 264 (7 KB)	Papa November	Cropped and rm opaque background using GIMP. No copyright claimed for non-creative derivative work
	15:07, 27 February 2008	288 × 288 (7 KB)	Unitsphere	{{Information \|Description=This figure plots equivalent quantities used in the theory of scattering from composite specimens, but with a variety of units, onto a single plot. \|Source=self-made \|Date=February 27, 2008 \|Author= P. Fraundorf \|Permission=see