Classified Abstracts The label immediately following the title of each item denotes country of origin of Abstracting Editor’s Note. publication, and that at the end qf each abstract indicates country of origin of work (where known). General
Production of Low Pressures
16 766. Chemisorption of nitrogen on molybdenum. T. Oguri, J. Phys. Sot., Japan, 19 (1), Jan. 1964, 77-83.
11 : 19 759. Ultra-high vacuum system for use with a polarizing spectrometer. (U.S.A.) J. F. Dettorre et al., Rev. Sci. Instrum., 35 (4), April 1964, 503-6.
16 767. Adsorption of helium four on Saran charcoal at temperatures below 5°K. J. R. Dacey and M. H. Edwards, Canad. J. Phys., 42 (2), Feb. 1964,241-250. 16 768. A comparison of the low-temperature adsorption of nitrogen and methane from hydrogen gas on three different adsorbents. M. J. Hiza, and A. J. Kidnay, Advances in Cryogenic Engineering, (New York, Plenum Press, 1963), Vol. 8, 174-182.
Vacuum Applications 13
760. A vacuum differential weighing machine. Control, 8 (70), April 1964, 195.
of Gases 14
16 769. Gettering of residual gas and the adsorption of hydrogen on evaporated molybdenum films at liquid-nitrogen temperatures. A. L. Hunt, C. C. Damm and E. C. Popp, Advances in Cryogenic Engineering, (New York, Plenum Press, 1963) Vol. 8, 110-l 15.
Baffle with anti-migration barrier and its cooling with a liquidgas booster pump. See Abstr. No. 811. 14 761. Molecular drag against a moving body. Addition to the theory of the quartz fibre manometer. (Germany) H. Gabriel, Z. Phys. Chem., 39 (l-2), Oct. 1963, 98-103 ; (in German).
16 770. An atomic view of adsorption. G. Ehrlich, Brit. J. Appl. Phys., 15 (4), April 1964, 349-364. 16 771. Influence of oxygen on the surface mobility of tin atoms in thin films. H. L. Caswell and Y. Budo, J. Appl. Phys., 35 (3), March 1964, 644-647.
Gases and Solids
16 762. The effect of working in an air-vacuum on the sorption characteristics of wood. (Germany) At temperatures above O”C, and adsorption of water vapor by bodies containing cellulose is much greater than the adsorption of non-polar gases. In the case of the wood, the adsorption is so high that practically identical results are obtained whether the experiments are carried out in vacua or in the ordinary atmosW. J. S. phere. (Germany) A. Schneider, Vacuum Technik, 13 (4), May 1964, 119.
16 772. Studies on chemisorption of nitrogen on tungsten with the field emission microscope. T. Oguri, J. Phys. Sot., Japan, 19 (I), Jan. 1964,83-91.
17 : 21 The limiting vacuums of condensation pumps. See Abstr. No. 797.
16 763. The physics and technique of absorption and desorption procedures at low pressures. (Germany) Vukuum Tech., 12 (7), Nov. 1963, 215-221 ; (in German).
17 773. Thermodynamic and kinetic considerations of the vacuum metallurgical process. (Germany) The author considers the equilibrium between the melt, the crucible material and the gaseous phase, making use of the law of mass action and the usual thermodynamic functions. Transport phenoma and rate of evaporation are also considered. The effective pressure of the gas phase in the melt is greatly influenced by hydrostatic effects, size of gas bubbles and surface tension as well as by shape of crucible (ratio of surface area to volume). As a result the final gas content of the product may remain practically constant once a certain degree of vacuum has been reached and any further lowering of pressure has no effect.
I6 764. Effects of nitrogen, methane and oxygen on structure and electrical properties of thin tantalum films. D. Gerstenberg and C. J. Calbick, J. Appl. Phys., 35 (2), Feb. 1964, 402-407. 16 765. Adsorption of hydrogen on solidified-gas films. A. L. Hunt, C. E. Taylor and J. E. Omohundro, Advances in Cryogenic Engineering, (New York, Plenum Press, 1963), Vol. 8, 100-109.
E. Erben, Vakuum Technik, 13 (4), May 1964, 111-115. 313