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The catalytic activity and structure of evaporated silver films used for the oxidation of carbon monoxide
394
Classified Abstracts 968---974
41 : 16 : 30 Depletive adsorption of hydrogen and carbon monoxide on nickel oxide. See Abstr. No. 889. 41 : 16 : 30 Surface potential study of the ehemisorption of hydrogen and carbon monoxide on evaporated copper and gold films. See Abstr. No. 887. 41 : 16 : 37 The catalytic activity and structure of evaporated silver films used for the oxidation of carbon monoxide. See Abstr. No. 886. 41 : 47 : 22 Residual gas pressure in 200 W-CW magnetron made of commercial E copper of 99.9 purity (continuous vertical cast). See Abstr. No. 984. 41 : 47 Investigations on the structure and gettering properties of Zr-AI alloys. See Abstr. No. 976. A flashiess getter of low operating temperature. 975.
41 : 47 See Abstr. No.
41 : 37 Preparation of pure tungsten and molybdenum by two different vacuum electron bombardment methods. See Abstr. No. 950. 41 : 30 : 33 Investigations of titanium sheets for sputtering-ion pumps. See Abstr. No. 924.
42.
Waxes, Lubricants, Cements, Lacquers, Paints, Oils
44 : 38 Limits of the vacuum processing of insulating oils in the electrical industry. See Abstr, No. 951.
47.
47 : 40 : 30 972. Methods employed for measuring the gas evolution from getters during evaporation. (Italy) The experimental method employed for the measurement of the total gas quantity evolved from getters during evaporation is described. The conditions of measurements, dictated by the limitations involved in the method, are discussed. Examples are given showing the attainable reproducibility and illustrating some possible other applications of the method. At the same time a technique for the analysis of the gases evolving from the getter is illustrated using the omegatron as a mass analyser associated to a conventional gas collection and admission system. (Italy) (Authors) P. della Ports, et al., 2nd Internat. Syrup. residual gases in electron tubes, Milan, (March 1963), Nuovo Cimento (in press).
Glass, Ceramics and Refractory Oxides
42 : 36 : 33 Oxygen outgassing caused by electron bombardment of glass. See Abstr. No. 946.
44.
47 : 10 : 22 971. Residual gas spectra in high and very high vacuum systems. (Italy) The mass spectrum of gas in vacuum systems usually indicates the presence of several contributing sources. To help in identifying these, a n u m b e r of gases, solvents a n d p u m p oils have been individually examined. F o r this purpose a 2 in. radius commercial mass spectrometer having a resolution of a b o u t 50, mass r a n g e 2-100, and ionizing electron beam energy of 70 V was used. The results so obtained help in the interpretation of results obtained with other mass spectrometers of the same type. They are also found to be qualitatively applicable to omegatron results when the same electron beam energy is used. (Great Britain) (Author) J. R. Bailey, 2nd Internat. Symp. residual gases in electron tubes, Milan, (March 1963), Nuovo Cimento (in press).
Outgassing Data, Vapour Pressure Data, Gettering Data
47 968. Evaluation of vapor-pressure data for mercury, lithium, sodium and potassium. (U.S.A.) W. T. Hicks, J. Chem. Phys., 38 (8), 15 April 1963, 1873-1880. 47
969. Outgassing unit. (Great Britain) Anon., Engineer, 215 (5598), 10 May 1963, 878. 47 : 12 : 33 970. The measurement of residual gases in electron tubes. (Italy) Different methods and techniques employing the omegatron mass spectrometer for determining the residual gases in small receiving tubes as well as the gases evolved during their functioning are described. Some preliminary results which are generally applicable to this type of measurements are discussed. As a practical illustration of this method, data are given for a typical receiving tube employing different getters and at various life test lengths. (Italy) (Authors) P. della Ports, et al., 2nd Internat. Symp. residual gases in electron tubes, Milan, (March 1963), Nuovo Cimento (in press).
47:12 973. On the residual pressures of N~, CO and H~ over bulk getters of thorium and zirconium alloys. (Italy) The results found in the literature for the characterization of Ceralloy 400 as a high temperature bulk getter have been experimentally tested, and similar measurements have also been made on St 101. In these measurements, ultra-high vacuum techniques were employed and extreme care was taken in preparing the sample so as to avoid any external influence capable of invaliLJIJ~ dating the results. A mass spectrometer of the o m c g ~ r o n ..... was used to distinguish the different gases at equilibrium with the sample. For sorbed C O and Nz no measurable dissociation pressure was found up to temperatures of the order of 1200°C where evaporation of the metal occurs. In the case of hydrogen an equilibrium pressure was observed, as a typical function of temperature and concentration. (Italy) (Authors) T. A. Giorgi and F. Ricca, 2nd Internat. Symp. residual gases in electron tubes, Milan, (March 1963), Nuovo Cimento (in press).
47 : 16 974. Non-evaporating getters with surface adsorption and porediffusion. (Italy) Two general demands are existing for non-evaporating getters : a large capacity for gas sorption and a high pumping speed. Whereas in the k n o w n flashless getters only a bulk reaction is efficient in the gettering mechanism, new systems were developed with respect to the chemisorption of gases at the surface of an active metal. With regard to an increase of capacity, metal powders were used with a high surface area. The effect of additive components is discussed, which prevent a decrease of the high surface area of this powder during a heat treatment. The created maximum capacity could not be utilised, if the metal powder would be pressed into pellets, as the transport mechanism of bulk or grain-boundary diffusion permits ~no high pumping speeds. Therefore the Knudsen molecular flow in a pore system is used as means of transportation of the gas into
Classified Abstracts 968---974
41 : 16 : 30 Depletive adsorption of hydrogen and carbon monoxide on nickel oxide. See Abstr. No. 889. 41 : 16 : 30 Surface potential study of the ehemisorption of hydrogen and carbon monoxide on evaporated copper and gold films. See Abstr. No. 887. 41 : 16 : 37 The catalytic activity and structure of evaporated silver films used for the oxidation of carbon monoxide. See Abstr. No. 886. 41 : 47 : 22 Residual gas pressure in 200 W-CW magnetron made of commercial E copper of 99.9 purity (continuous vertical cast). See Abstr. No. 984. 41 : 47 Investigations on the structure and gettering properties of Zr-AI alloys. See Abstr. No. 976. A flashiess getter of low operating temperature. 975.
41 : 47 See Abstr. No.
41 : 37 Preparation of pure tungsten and molybdenum by two different vacuum electron bombardment methods. See Abstr. No. 950. 41 : 30 : 33 Investigations of titanium sheets for sputtering-ion pumps. See Abstr. No. 924.
42.
Waxes, Lubricants, Cements, Lacquers, Paints, Oils
44 : 38 Limits of the vacuum processing of insulating oils in the electrical industry. See Abstr, No. 951.
47.
47 : 40 : 30 972. Methods employed for measuring the gas evolution from getters during evaporation. (Italy) The experimental method employed for the measurement of the total gas quantity evolved from getters during evaporation is described. The conditions of measurements, dictated by the limitations involved in the method, are discussed. Examples are given showing the attainable reproducibility and illustrating some possible other applications of the method. At the same time a technique for the analysis of the gases evolving from the getter is illustrated using the omegatron as a mass analyser associated to a conventional gas collection and admission system. (Italy) (Authors) P. della Ports, et al., 2nd Internat. Syrup. residual gases in electron tubes, Milan, (March 1963), Nuovo Cimento (in press).
Glass, Ceramics and Refractory Oxides
42 : 36 : 33 Oxygen outgassing caused by electron bombardment of glass. See Abstr. No. 946.
44.
47 : 10 : 22 971. Residual gas spectra in high and very high vacuum systems. (Italy) The mass spectrum of gas in vacuum systems usually indicates the presence of several contributing sources. To help in identifying these, a n u m b e r of gases, solvents a n d p u m p oils have been individually examined. F o r this purpose a 2 in. radius commercial mass spectrometer having a resolution of a b o u t 50, mass r a n g e 2-100, and ionizing electron beam energy of 70 V was used. The results so obtained help in the interpretation of results obtained with other mass spectrometers of the same type. They are also found to be qualitatively applicable to omegatron results when the same electron beam energy is used. (Great Britain) (Author) J. R. Bailey, 2nd Internat. Symp. residual gases in electron tubes, Milan, (March 1963), Nuovo Cimento (in press).
Outgassing Data, Vapour Pressure Data, Gettering Data
47 968. Evaluation of vapor-pressure data for mercury, lithium, sodium and potassium. (U.S.A.) W. T. Hicks, J. Chem. Phys., 38 (8), 15 April 1963, 1873-1880. 47
969. Outgassing unit. (Great Britain) Anon., Engineer, 215 (5598), 10 May 1963, 878. 47 : 12 : 33 970. The measurement of residual gases in electron tubes. (Italy) Different methods and techniques employing the omegatron mass spectrometer for determining the residual gases in small receiving tubes as well as the gases evolved during their functioning are described. Some preliminary results which are generally applicable to this type of measurements are discussed. As a practical illustration of this method, data are given for a typical receiving tube employing different getters and at various life test lengths. (Italy) (Authors) P. della Ports, et al., 2nd Internat. Symp. residual gases in electron tubes, Milan, (March 1963), Nuovo Cimento (in press).
47:12 973. On the residual pressures of N~, CO and H~ over bulk getters of thorium and zirconium alloys. (Italy) The results found in the literature for the characterization of Ceralloy 400 as a high temperature bulk getter have been experimentally tested, and similar measurements have also been made on St 101. In these measurements, ultra-high vacuum techniques were employed and extreme care was taken in preparing the sample so as to avoid any external influence capable of invaliLJIJ~ dating the results. A mass spectrometer of the o m c g ~ r o n ..... was used to distinguish the different gases at equilibrium with the sample. For sorbed C O and Nz no measurable dissociation pressure was found up to temperatures of the order of 1200°C where evaporation of the metal occurs. In the case of hydrogen an equilibrium pressure was observed, as a typical function of temperature and concentration. (Italy) (Authors) T. A. Giorgi and F. Ricca, 2nd Internat. Symp. residual gases in electron tubes, Milan, (March 1963), Nuovo Cimento (in press).
47 : 16 974. Non-evaporating getters with surface adsorption and porediffusion. (Italy) Two general demands are existing for non-evaporating getters : a large capacity for gas sorption and a high pumping speed. Whereas in the k n o w n flashless getters only a bulk reaction is efficient in the gettering mechanism, new systems were developed with respect to the chemisorption of gases at the surface of an active metal. With regard to an increase of capacity, metal powders were used with a high surface area. The effect of additive components is discussed, which prevent a decrease of the high surface area of this powder during a heat treatment. The created maximum capacity could not be utilised, if the metal powder would be pressed into pellets, as the transport mechanism of bulk or grain-boundary diffusion permits ~no high pumping speeds. Therefore the Knudsen molecular flow in a pore system is used as means of transportation of the gas into