Ikegami, Hidetsugu

Kokame, Jun

Uemura, Yosiaki

Kyoto University Research Information Repository

Title Theoretical Consideration for the Mechanism of the Probe Gasfor High Vacuum Leak-DetectionAuthor(s)Ikegami, Hidetsugu; Kokame, Jun; Uemura, YosiakiCitationBulletin of the Institute for Chemical Research, KyotoUniversity (1954), 32(5): 216-216Issue Date1954-09-31URL http://hdl.handle.net/2433/75459RightType Departmental Bulletin PaperTextversionpublisherKyoto University ABSTRACTS         Theoretical Consideration for the Mechanism of the             Probe Gas for High Vacuum Leak-DetectionHidetsugu IKEGAMI, Jun KOKAME and Yosiaki UENIIIE A(K. Kimura Laboratory)    In order to analyze the mechanism of the leak-detection with the probe gas, the substitu-tion sensitivity factor i, (J.Blears, j.H.Leck, Journ. of Sc. Instr. Sup. No. 1, 22, (1952)) for the ionization guage (apparent change of air pressure in the vacuum caused by covering leak with probe gas) (mean air pressure before probing) was caluculated. It was assumed that, Poiseuille's law is applicable for the gas flow through the leak (I.Blears : ibirt ; S.Dushman : "Scientific Foundation of Vacuum Technique", p. 84, (john Wiley & Sons, New York, 1949); A. Gutherie, R . K. Wakering : "Vacuum Equipment & Technigues," p. 22, (McGraw-Hill Book Co., New York, 1949)) and the ionization cross-section of the gas molecule is built up as the sum of the contributions from the component atoms (H. S. W. Massey and E. H. S. Burhop : "Electronic Ionic Impact Phenomena," p.191, (Oxford, at the Clarendon Press, 1952)).    The values of calculted for H2, CO2, C.,F110 and coal gas were in agreement with the observed values approximately, The theory was, however, in valid for the "vapour" with low vapor pressure at room temperature such as Cd-Io, CCL etc. The reason of these dis-agreements is mainly ascribable to the "imperfection" of vapors ; this effect reduces the ,p-valtie in a way for which Poiseuille's law is of no quantitative use. So, the more rigorous treament for vapours would be desirable.           ( Rear/ at the semi-annual meeting of the Institute on June 11, 1954)             On the Constitution of Zinc-Ferrite. (II)Isao KUSHIMA and Tsuyoshi AMAR LIMA (Sawamura Laboratory)    In the previous report. the constitution of Fe203-ZnFe204 system was reported. In this paper explanation is given on the constitution of the ZnFe204-ZnO system and the forma-tion of magnetite in the Fe203--ZnO system. Fe202 and ZnO are mixed in various molar ratio (ZnO: Fe,03), and the mixtures are pressed in the mould under 80 kg./cm. pressure and heated at 1000', 1100' and 1250°C for 3 hours.    For each sintered sample, Debye-Scherrer X-ray photograph was taken, and the magnet-ic properties were measured by the ballistic galvenometer method. After these experiments 21C )

Theoretical Consideration for the Mechanism of the Probe Gas for High Vacuum Leak-Detection

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Theoretical Consideration for the Mechanism of the Probe Gas for High Vacuum Leak-Detection

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