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1066. Mechanical McLeod gauge for accurate measurement of pressure in the 5μ–500μ range
Classified Abstracts 1065--1074
Classified
Abstracts
Abstracting Editor's Note. The label immediately following the title of each item denotes country of origin of publication, and that at the end of each abstract indicates country of origin of work (where known). General Vacuum Science and Engineering 11.
Production of Low Pressures
circuit without the use of solid barriers or restrictions. In the particular installation described, with the airstream expanding into 15m torr, upstream pressures ranging from 3m torr to .9m torr can be maintained. (U.S.A.)
11 Thermal desorption as a method of studying adsorption phenomena in high vacuum. See Abstr. No. 1074.
1065. Ultra-high vacuum in unbaked
C. H. Stallings and D. H. Martin, Rev. Sci. Instrum., 35 (8), 1964, 1011-1013.
11:25:22 (rubber-sealed) systems.
(U.S.S.R.)
16.
In connection with a research on the sorption properties of aluminium oxide films, a number of experiments were carried out to obtain an ultra-high vacuum in a low temperature (rubbersealed) system. The standard installation used (VA-05-1) was provided with liquid nitrogen and helium traps and was fitted with a magneto-ionization gauge VIM. A standard ionization gauge (LM-2) was used for calibration purposes. A vacuum of the order of 10 -8 tort (as recorded on VIM) could be obtained after about three hours of pumping (flow rate 10-2mm3/sec). By replacing the VIM with a special" cold " manometer, parts of which were cooled with liquid helium, a final pressure of the order of 10 -22 tort could be reached due to increased pumping action. (U.S.S.R.)
16 Theoretical problems of the anomalous optics of thin metallic films. See Abstr. No. 1099. 16 Ion bombardment induced emission of sorbed gas from glass surfaces. See Abstr. No. 1118. 16 Some specific features of the diffusion processes during the formation of surface coatings by the condensation process. See Abstr. No. 1136. 16 • 41 1071. Interaction of Oxygen with (110) Nickel. (U.S.A.) The authors conclude that oxygen readily penetrates into the nickel lattice, occupying substitutional sites leading to oxygennickel structures of increasing O content till saturation is reached. (NiO rocksalt structure). By heating the oxide covered crystal in vacuum, some of the intermediate structures can be observed in the reverse order. (U.S.A.)
L. L. Gerasimov et al., Pribory i Tekh. Eksper., (4), 1964, 155156. (In Russian)
12.
Measurement of Low Pressures
12:22 1066. Mechanical McLeod gauge for accurate measurement of pressure in the 5/~-500tz range. (U.S.A.) By controlling the pressure of the test gas, the authors are able to extend the pressure range of a Decker gauge from its normal value of 30t~-600tL to 5tz-500tL. J. T. Park, Rev. Sci. Instrum., 35 (2), 1964, 242-243.
R. L. Park and H. E. Farnsworth, J. Appl. Phys., 35 (7), July 1964, 2220-5. 16 : 17 1072. Adsorption of binary mixtures of gases at very low temperatures. (Italy) The adsorption of hydrogen on previously adsorbed layers of nitrogen or argon at 4 ° K was studied. It appears that the cryotrapping starts at a lower pressure than the vapour pressure at 4°K.
12:22 1067. Micromanometers. (U.S.A.) E. S. Burka, Instr. & Contr. Systems, 31 (9), Sept. 1964, t39-140.
D. A. Degras, Nuovo Cimento Suppl., (Ser. 1), 1 (2), 663-672.
12 : 22 1068. Vacuum instrumentation. (U.S.A.) Anon., Instr. & Contr. Systems, 31 (9), Sept. 1964, 110-114.
16 : 41 1073. Sorption measurements in ultra-high vacuum. (U.S.A.) The sorption in the test chamber is estimated from the metered inflow necessary to keep the chamber pressure constant at 10 -z° tort. Results of the sorption of N~ on Nb filament and evaporated Mo film are given. Possible adsorption and desorption mechanisms are discussed. R. Gibson, et al., Trans. 10 Nat. Vae. Symp., 1963, 8-92.
12 : 22 1069. Calibrating thermal conductivity gauges. (U.S.A.) J. M. Benson, Instr. & Contr. Systems, 31 (9), Sept. 1964, 115-117.
15.
Gases and Solids
Fluid Dynamics
15:25 1070. Supersonic annular nuzzle as a differential barrier. (U.S.A.) The authors show how supersonic annular nozzles can be used to maintain a vacuum pressure differential between two parts of a
16 : 11 1074. Thermal desorption as a method of studying adsorption phenomena in high vacuum. (Japan) Y. Tuzi, J. Vae. Soe. Japan, 7 (5), 156-161. (In Japanese) 447
Classified
Abstracts
Abstracting Editor's Note. The label immediately following the title of each item denotes country of origin of publication, and that at the end of each abstract indicates country of origin of work (where known). General Vacuum Science and Engineering 11.
Production of Low Pressures
circuit without the use of solid barriers or restrictions. In the particular installation described, with the airstream expanding into 15m torr, upstream pressures ranging from 3m torr to .9m torr can be maintained. (U.S.A.)
11 Thermal desorption as a method of studying adsorption phenomena in high vacuum. See Abstr. No. 1074.
1065. Ultra-high vacuum in unbaked
C. H. Stallings and D. H. Martin, Rev. Sci. Instrum., 35 (8), 1964, 1011-1013.
11:25:22 (rubber-sealed) systems.
(U.S.S.R.)
16.
In connection with a research on the sorption properties of aluminium oxide films, a number of experiments were carried out to obtain an ultra-high vacuum in a low temperature (rubbersealed) system. The standard installation used (VA-05-1) was provided with liquid nitrogen and helium traps and was fitted with a magneto-ionization gauge VIM. A standard ionization gauge (LM-2) was used for calibration purposes. A vacuum of the order of 10 -8 tort (as recorded on VIM) could be obtained after about three hours of pumping (flow rate 10-2mm3/sec). By replacing the VIM with a special" cold " manometer, parts of which were cooled with liquid helium, a final pressure of the order of 10 -22 tort could be reached due to increased pumping action. (U.S.S.R.)
16 Theoretical problems of the anomalous optics of thin metallic films. See Abstr. No. 1099. 16 Ion bombardment induced emission of sorbed gas from glass surfaces. See Abstr. No. 1118. 16 Some specific features of the diffusion processes during the formation of surface coatings by the condensation process. See Abstr. No. 1136. 16 • 41 1071. Interaction of Oxygen with (110) Nickel. (U.S.A.) The authors conclude that oxygen readily penetrates into the nickel lattice, occupying substitutional sites leading to oxygennickel structures of increasing O content till saturation is reached. (NiO rocksalt structure). By heating the oxide covered crystal in vacuum, some of the intermediate structures can be observed in the reverse order. (U.S.A.)
L. L. Gerasimov et al., Pribory i Tekh. Eksper., (4), 1964, 155156. (In Russian)
12.
Measurement of Low Pressures
12:22 1066. Mechanical McLeod gauge for accurate measurement of pressure in the 5/~-500tz range. (U.S.A.) By controlling the pressure of the test gas, the authors are able to extend the pressure range of a Decker gauge from its normal value of 30t~-600tL to 5tz-500tL. J. T. Park, Rev. Sci. Instrum., 35 (2), 1964, 242-243.
R. L. Park and H. E. Farnsworth, J. Appl. Phys., 35 (7), July 1964, 2220-5. 16 : 17 1072. Adsorption of binary mixtures of gases at very low temperatures. (Italy) The adsorption of hydrogen on previously adsorbed layers of nitrogen or argon at 4 ° K was studied. It appears that the cryotrapping starts at a lower pressure than the vapour pressure at 4°K.
12:22 1067. Micromanometers. (U.S.A.) E. S. Burka, Instr. & Contr. Systems, 31 (9), Sept. 1964, t39-140.
D. A. Degras, Nuovo Cimento Suppl., (Ser. 1), 1 (2), 663-672.
12 : 22 1068. Vacuum instrumentation. (U.S.A.) Anon., Instr. & Contr. Systems, 31 (9), Sept. 1964, 110-114.
16 : 41 1073. Sorption measurements in ultra-high vacuum. (U.S.A.) The sorption in the test chamber is estimated from the metered inflow necessary to keep the chamber pressure constant at 10 -z° tort. Results of the sorption of N~ on Nb filament and evaporated Mo film are given. Possible adsorption and desorption mechanisms are discussed. R. Gibson, et al., Trans. 10 Nat. Vae. Symp., 1963, 8-92.
12 : 22 1069. Calibrating thermal conductivity gauges. (U.S.A.) J. M. Benson, Instr. & Contr. Systems, 31 (9), Sept. 1964, 115-117.
15.
Gases and Solids
Fluid Dynamics
15:25 1070. Supersonic annular nuzzle as a differential barrier. (U.S.A.) The authors show how supersonic annular nozzles can be used to maintain a vacuum pressure differential between two parts of a
16 : 11 1074. Thermal desorption as a method of studying adsorption phenomena in high vacuum. (Japan) Y. Tuzi, J. Vae. Soe. Japan, 7 (5), 156-161. (In Japanese) 447