On the Rate of Decomposition of Diffusion Pump Oil

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概要

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• The rate of decomposition of diffusion pump oil under the working condition seems to be an important quantity in reference to the vacuum. The following experiment was carried out to give an answer to the problems, "Whether various metals really catalyse the decomposition of diffusion pump oil ? and "Will the gaseous components of the decomposition products limit the ultimate vacuum of an oil diffusion pump?" The quantity of not condensing gaseous components of the decomposition products accumulated in a vessel in a given time was measured for the two typical oils, n-dioctylhexahydrophthalate and silicone DC-703, by using a flow meter designed by R. Ueda. The results show that the rate of decomposition is of the order of 10^<-6> litre micron Hg per sec. per square centimeter of surface for both oil. The ester slightly suffered from catalitic decomposition, though the silicone had no indication. The measured rate of decomposition is so low that will never contribute more than 1×10^<-5> micron Hg to the ultimate vacuum of an oil diffusion pump.

• 社団法人日本物理学会の論文
• 1954-04-25

著者

• Hayashi Chikara

  Department Of Physics Tokyo University

関連論文

• A New Method of Trapping Oil Vapour.
• Use of Phosphorous Pentoxide as a Dehydrating Agent in High Vacuum Technique.
• On the Rate of Decomposition of Diffusion Pump Oil

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