How to Calculate dE/dx for a Mixture of Gases?

[jbb88]

Im trying to figure out how to find the dE/dx for a mixture of gases. I can find how to figure it out for an individual molecule knowing dE/dx for each element, but can't find how to find it for a mixture of two molecules of gases knowing dE/dx for each gas. Is there anywhere I can find the formula or mixing rules for this?

 

[Bob_for_short]

dE/dx is density dependent. For a gas mixture with the Dalton law n=n₁+n₂ the resulting dE/dx wil be sum of "partial" dE/dx, I think.

Bob_for_short.

 

[Bob S]

You can add the dE/dx for each partial pressure of gas to get a total dE/dx. Use the Bethe-Bloch formula for MeV per gram/cm^2. See LBL Particle Data Book:
http://pdg.lbl.gov/2007/reviews/passagerpp.pdf
Section 27.2.6 deals with dE/dx for mixtures and compounds.