Abstract
a vacuum evaporation apparatus is described which consists of an all-metal bell jar, fitted with two observation windows, connected through a liquid-air trap to a mercury diffusion pump unit which is fitted with a dry ice trap at the throat of the pump. The bell jar and liquid-air trap can be placed in an oven for baking out up to a temperature of 160°C. A McLeod gauge joined to a trap which, in turn, is connected via a stopcock to the backing line of the diffusion pump can be used for the measurement of the throughput of gases and vapours during and after baking. The apparatus facilitated the production of silver films with an exceptionally low absorption. A discussion of the performance of the plant is added.
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