Shinku
Online ISSN : 1880-9413
Print ISSN : 0559-8516
ISSN-L : 0559-8516
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Volume 8, Issue 1
Displaying 1-3 of 3 articles from this issue
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  • Comments on Pumping Methods for Obtaining Ultrahigh Vacuum
    Norman MILLERON
    1965 Volume 8 Issue 1 Pages 5-8
    Published: January 20, 1965
    Released on J-STAGE: January 28, 2010
    DOIhttps://doi.org/10.3131/jvsj.8.5
    JOURNAL FREE ACCESS
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    A departure from standard practice is taken. UHV is not taken to de synonymous with a region of pressure only. Rather, vacuum is regarded as a permissive enviroment in which to work. A suggestion for a scale of vacuum permissiveness in grades from 1 to 20, 20 being defined as a perfect sink over 4π solid angle, is given. Pumping efficiency5 and where a pump begins5 are refened to. Brief remarks about combinations of pumps, especially cryo and titanium sublimation pumps arè given.
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  • CdSe Thin-Film Formation by the Method of Flush Co-evaporation
    Yosiaki TAKETA, Naoki HUKUTI, Ituki BAN
    1965 Volume 8 Issue 1 Pages 9-14
    Published: January 20, 1965
    Released on J-STAGE: September 29, 2009
    DOIhttps://doi.org/10.3131/jvsj.8.9
    JOURNAL FREE ACCESS
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    Photosensitive films were prepared by the flash evaporation of CdSe. Two types of samples have been examined : one was of Cu-activated CdSe, the other was of Cu-activated CdSe-CdCl2 mixtures.
    The following properties of evaporated CdSe films were investigated : dependence of photoconductivity upon film composition and its densities, X-ray diffraction, photosensitive characteristics.
    The results of these mesurements indicated that photosensitivity increases with Cu and CdCl2 density, CdSe film was polycrystalline substance (being hexagonal), the relation of light intensity to photocurrent was super-linear, and that the time constant was smaller in comparision with sintered CdSe layer.
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  • The Measured Speed of an “Ideal Pump”
    B. B. DAYTON
    1965 Volume 8 Issue 1 Pages 15-21
    Published: January 20, 1965
    Released on J-STAGE: September 29, 2009
    DOIhttps://doi.org/10.3131/jvsj.8.15
    JOURNAL FREE ACCESS
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    The definitions of “true speed” and the influence of the shape of the test dome on the “measured speed” of diffusion pumps are reviewed. Equations are given for the measured speed to be expected from an “ideal pump” (for which no molecules return to test dome) and for the molecular conductance (as measured with a tubulated gauge) of a pipe directly connected to a pump of the same diameter. Approximate equations are also given for the influence on the reading of a nude ionization gauge of the average gas temperature due to molecules evaporating or scattered from the cold surface of a cryopu mp or from the hot surfaces of a diffusion pump.
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