Mean Adsorption Time of oil Molecules Measured by Non-Stationary Flow Method

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概要

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• The mean adsorption time, τ, of DOP (usually used as high vacuum pumping fluid) on borosilicate glass, is obtained from the measurement of the time lag in setting up the stationary flow of the vapor through a glass tube evacuated to ultrahigh vacuum. In the experiment, the time variation of flow rate of oil vapor is measured by an ionization gauge cooled by liquid nitrogen. The glass tube was maintained at a temperature between 65℃ and 90℃. Although τ for adsorption of an approximately monomolecular layer cannot be expressed by a simple expression, τ for further adsorption follows the relation τ= τ_0 exp (E/RT), where E=22.4 kcal/mole and τ_0=1.1×10^<-16> sec. Some discussions are made on the first molecular layer adsorption.

• 社団法人応用物理学会の論文
• 1965-02-15

著者

• Tominaga Goroh

  Institute Of Industrial Science University Of Tokyo

関連論文

• Photon Stimulated Desorption of Positive Ions from LiF
• Mean Adsorption Time of oil Molecules Measured by Non-Stationary Flow Method

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