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Brazing thin (high vacuum) beryllium windows
117
Classified Abstracts 329-345
Materials 40.
and Techniques
used in Vacuum
Gases and Vaponrs 40
329. Ionization and excitation processes in argon, krypton and the CZ hydrocarbons produced by various means. C. E. Melton, J. Chem. Phys., 37 (3), 1 Aug. 1962, 562-566. 40 330. Temperature dependence of ionic mobilities in gas mixtures. G. E. Courville and M. A. Biondi, J. Chem. Phys., 37 (3), 1 Aug. 1962, 616-620. 40 331. Diffusional contribution to the total flow from a Knudsen cell. W. L. Winterbottom, J. Chem. Phys., 37 (4), 15 Aug. 1962, 784-793. 40 332. Reflection and dissociation of H, on tungsten. J. N. Smith, Jr., and W. L. Fite, J. Chem. Phys., 37 (4), 15 Aug. 1962, 898-904. 40 333. Scattering of helium and argon from the cleavage plane of lithium fluoride. J. C. Crews, J. Chem. Whys., 37 (9), 1 Nov. 1962, 2004-2008.
Technology
Formation condition and structure of thin epitaxial germanium 6lms on single crystal substrata. See Abstr. No. 296. 41 Thin film memory store.
See Abstr. No. 297.
41 Variation of the magnetic resistance of thin foils of bismuth with temperature and field strength. See Abstr. No. 286.
42.
Glass, Ceramics and Refractory Oxides 42
Ultra high vacuum in small glass vessels.
See Abstr. No. 250. 42
Gas desorption from glass.
45.
See Abstr. No. 254.
Soldering, Welding, Brazing, Solders 45
Brazing thin (high vacuum) beryllium windows. J. P. Papacosta, et al., Rev. Sci. Znstrum., 33 (ll), 1289-1290.
: 23
341.
Nov. 1962,
40 334. Some new metastable states of molecules. W. Lichten, J. Chem. Phys., 37 (9), 1 Nov. 1962,2152-2154.
47.
40 335. Studies of metastable ion transitions with a 180” mass spectrometer. N. D. Coggeshall, J. Chem. Phys., 37 (1 l), 15 Nov. 1962, 21672175. 40 336. Surface recombination of nitrogen atoms on quartz. T. Marshall, J. Chem. Phys., 37 (lo), 15 Nov. 1962, 2501-2502. 337. Low energy collision cross sections of H- and OH- ions in oxygen. C. E. Baker, et al., J. Chem. Phys., 37 (ll), 1 Dec. 1962, 25712574. 40 338. Charge exchange between gaseous ions and atoms. D. Rapp and W. E. Francis, J. Chem. Whys., 37 (ll), 1962, 2631-2645.
1 Dec. 40
339. Carbon monoxide-oxygen atom reaction. B. H. Mahan and R. B. Solo, J. Chem. Phys., 1962, 2669-2677.
37 (1 l), 1 Dec.
40 340. Occurrence of H+s in the field ionization of hydrogen. T. C. Clemens and E. N. Muller, J. Chem. Phys., 37 (ll), 1 Dec. 1962, 2684-2687.
41.
Metals and Alloys 41
A quick way of making pure iron.
See Abstr. No. 328.
41 Preferential adsorption of normal hydrocarbons on cast iron. See Abstr. No. 253.
Outgassing Data, Vapour Pressure Data, Gettering Data 47
Chemisorption of oxygen on ordered tungsten surfaces. T. H. George and P. M. Stier, J. Chem. Phys., 37 (9), 1 Nov. 1962, 1935-1946. 342.
47 343. Effect of oxygen on the vapor pressure of uranium. R. J. Ackermann, et al., J. Chem. Phys., 37 (1 l), 1 Dec. 1962, 2692-2698. 47
Chemisorption of hydrogen on cobalt. C. R. Abeledo and P. W. Selwood, J. Chem. Phys., 1 Dec. 1962, 2709-2712.
344.
37 (ll),
47 : 56 345. The gettering of chemically active gases in a mercury arc discharge and its significance for steel tank convertors. Switzerland. The phenomenon of gas clean-up by the steel walls of mercury arc discharge vessels has been known for a long time. The mechanism has been investigated quantitatively, so that-to use the terminology of vacuum techniques-a pumping or gettering speed S can be calculated, which-in conjunction with the partial pressure p of chemically active gases-corresponds to a gettering capacity Qg = p.s. The method of measuring this quantity is described and it is shown that in a properly manufactured discharge vessel the pumping speed S for the constituents of air, other than the noble gases, is 8 to 10 I./set and more, at p = 1 0, for a comparatively small discharge current of only 30 A. Over a wide pressure range (1OF to 10-l torr) the pumping or gettering speed is proportional to l/p, i.e. the getter capacity Qg is independent of p. By measuring the partial pressures of all gases present in the atmospheric air for various loadings of the discharge vessel, it was found that even prior to the steel walls becoming saturated with chemically active gases the amount of rare gases (e.g. argon) can reach a dangerously high level ; this results in a reduction of the rated reverse voltage capacity of the discharge vessel.
Classified Abstracts 329-345
Materials 40.
and Techniques
used in Vacuum
Gases and Vaponrs 40
329. Ionization and excitation processes in argon, krypton and the CZ hydrocarbons produced by various means. C. E. Melton, J. Chem. Phys., 37 (3), 1 Aug. 1962, 562-566. 40 330. Temperature dependence of ionic mobilities in gas mixtures. G. E. Courville and M. A. Biondi, J. Chem. Phys., 37 (3), 1 Aug. 1962, 616-620. 40 331. Diffusional contribution to the total flow from a Knudsen cell. W. L. Winterbottom, J. Chem. Phys., 37 (4), 15 Aug. 1962, 784-793. 40 332. Reflection and dissociation of H, on tungsten. J. N. Smith, Jr., and W. L. Fite, J. Chem. Phys., 37 (4), 15 Aug. 1962, 898-904. 40 333. Scattering of helium and argon from the cleavage plane of lithium fluoride. J. C. Crews, J. Chem. Whys., 37 (9), 1 Nov. 1962, 2004-2008.
Technology
Formation condition and structure of thin epitaxial germanium 6lms on single crystal substrata. See Abstr. No. 296. 41 Thin film memory store.
See Abstr. No. 297.
41 Variation of the magnetic resistance of thin foils of bismuth with temperature and field strength. See Abstr. No. 286.
42.
Glass, Ceramics and Refractory Oxides 42
Ultra high vacuum in small glass vessels.
See Abstr. No. 250. 42
Gas desorption from glass.
45.
See Abstr. No. 254.
Soldering, Welding, Brazing, Solders 45
Brazing thin (high vacuum) beryllium windows. J. P. Papacosta, et al., Rev. Sci. Znstrum., 33 (ll), 1289-1290.
: 23
341.
Nov. 1962,
40 334. Some new metastable states of molecules. W. Lichten, J. Chem. Phys., 37 (9), 1 Nov. 1962,2152-2154.
47.
40 335. Studies of metastable ion transitions with a 180” mass spectrometer. N. D. Coggeshall, J. Chem. Phys., 37 (1 l), 15 Nov. 1962, 21672175. 40 336. Surface recombination of nitrogen atoms on quartz. T. Marshall, J. Chem. Phys., 37 (lo), 15 Nov. 1962, 2501-2502. 337. Low energy collision cross sections of H- and OH- ions in oxygen. C. E. Baker, et al., J. Chem. Phys., 37 (ll), 1 Dec. 1962, 25712574. 40 338. Charge exchange between gaseous ions and atoms. D. Rapp and W. E. Francis, J. Chem. Whys., 37 (ll), 1962, 2631-2645.
1 Dec. 40
339. Carbon monoxide-oxygen atom reaction. B. H. Mahan and R. B. Solo, J. Chem. Phys., 1962, 2669-2677.
37 (1 l), 1 Dec.
40 340. Occurrence of H+s in the field ionization of hydrogen. T. C. Clemens and E. N. Muller, J. Chem. Phys., 37 (ll), 1 Dec. 1962, 2684-2687.
41.
Metals and Alloys 41
A quick way of making pure iron.
See Abstr. No. 328.
41 Preferential adsorption of normal hydrocarbons on cast iron. See Abstr. No. 253.
Outgassing Data, Vapour Pressure Data, Gettering Data 47
Chemisorption of oxygen on ordered tungsten surfaces. T. H. George and P. M. Stier, J. Chem. Phys., 37 (9), 1 Nov. 1962, 1935-1946. 342.
47 343. Effect of oxygen on the vapor pressure of uranium. R. J. Ackermann, et al., J. Chem. Phys., 37 (1 l), 1 Dec. 1962, 2692-2698. 47
Chemisorption of hydrogen on cobalt. C. R. Abeledo and P. W. Selwood, J. Chem. Phys., 1 Dec. 1962, 2709-2712.
344.
37 (ll),
47 : 56 345. The gettering of chemically active gases in a mercury arc discharge and its significance for steel tank convertors. Switzerland. The phenomenon of gas clean-up by the steel walls of mercury arc discharge vessels has been known for a long time. The mechanism has been investigated quantitatively, so that-to use the terminology of vacuum techniques-a pumping or gettering speed S can be calculated, which-in conjunction with the partial pressure p of chemically active gases-corresponds to a gettering capacity Qg = p.s. The method of measuring this quantity is described and it is shown that in a properly manufactured discharge vessel the pumping speed S for the constituents of air, other than the noble gases, is 8 to 10 I./set and more, at p = 1 0, for a comparatively small discharge current of only 30 A. Over a wide pressure range (1OF to 10-l torr) the pumping or gettering speed is proportional to l/p, i.e. the getter capacity Qg is independent of p. By measuring the partial pressures of all gases present in the atmospheric air for various loadings of the discharge vessel, it was found that even prior to the steel walls becoming saturated with chemically active gases the amount of rare gases (e.g. argon) can reach a dangerously high level ; this results in a reduction of the rated reverse voltage capacity of the discharge vessel.