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原文由 Jin(querida) 发表:
Further molecules then take the place of those which have been decomposed and in turn they suffer the same fate.
Evidence indicates that the molecules are supplied mainly by surface diffusion since flooding a large area of the
specimen with electrons rapidly carbonizes hydrocarbon molecules and delays the build-up of contamination at a particular point.
Many workers rely upon a cold stage to minimize specimen contamination, the hydrocarbons then condensing preferentially on the cooled surface.
原文由 Jin(querida) 发表:From such information a mechanism of contamination has been proposed which involves several stages. Firstly,gas or vapour molecules present in the vacuum system are adsorbed on all surfaces. These adsorbedmolecules are not tightly bound to the surface although their sticking coefficient increases with decreasein temperature. Under the action of the electron beam hydrocarbon molecules are polymerized toproduce carbonaceous materials which become fixed. 参考一下感谢感谢 这下明白了
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