Helium & Hydrogen Escape Rates: Table & Physical Mechanism

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Gas permeability charts for Helium and Hydrogen can be found through Google, Google Books, and local university libraries. Greenhouse's "Hermeticity of Electronic Packages" is recommended for detailed information on this topic. The physical mechanism of gas escape involves gas atoms entering solids, occupying interstitial sites, or moving along grain boundaries. Gas permeation occurs as numerous gas atoms diffuse through the material and exit. Understanding these mechanisms is crucial for applications involving gas containment and material selection.
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Where could one find a table of Helium and/or Hydrogen escape rates through various materials? What is the Physical mechanism: is it tunneling only or other things contribute as well?

Thanks!
 
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You are looking for gas permeability charts and tables, some of which can be found through Google and Google Books (and your local university library). Are you looking for any materials in particular?

I don't have the book handy, but Greenhouse's Hermeticity of Electronic Packages has a lot of useful information.

The mechanism is that a gas atom enters the solid (in crystals, it might occupy an interstitial site or travel down grain boundaries) and randomly moves around. Gas permeation involves many, many gas atoms that diffused through and exited the other side of the material.
 

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