UHV materials


The key property for using materials in UHV is their vapour pressure. Too high vapour pressure immediately rules out the use of certain materials like Cd, As, Zn, oil, plastic and the like. Note that not only the vapour pressure at room temperature is relevant but also the behaviour under bakeout.

Another concern is the surface area and the ability to bind things like water. Metals usually do well here, especially when they hare polished surfaces. Porous ceramics and most types of plastics are bad.

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