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Spontaneous purification of metals from oxide films
Classified abstracts 303--305 41 The role of the molecular composition of the current of alloying elements in the preparation of silicon and germanium layers in vacuum. See abstract number 284. 41 A review of the growth and structure of thin films of germanium and silicon. See abstract number 285. 41 Amorphous oxide layers on gold and nickel films observed by electron microscopy. See abstract number 286. 41 Electrical conduction of thin aggregated metal films. See abstract number 292. 41 Magnetic fine structure and magnetic properties of uniaxial ferromagnetic films. See abstract number 296. 41 Cleavage in high vacuum of alkali halide single crystals--secondary electron emission. See abstract number 297. 41 Shape and energy of N~el walls in very thin ferromagnetic films. See abstract number 298. 41 Spontaneous purification of metals from oxide films. See abstract number 300. 41 High grade purification of zinc. See abstract number 302. 41:29 303. Application of rhenium and its alloys in electro-vacuum instruments. ( USSR) a. Rhenium as a thermoemitter Its general use is limited by its higher rate of evaporation compared with tungsten. On the other hand it is less sensitive to the presence of oxygen, marked deterioration in its emission properties beginning at an oxygen partial pressure of 10 -~ torr whilst a tungsten cathode becomes etched already at 10 -s torr. b. Rhenium-barium cathode No advantage over spongy tungsten cathode. c. Rhenium as core for high temperature thorium oxide cathodes Has proved satisfactory at temperatures 1900-2000°K and current densities of several hundred m A / c m 2 (high duty generator valves). d. Rhenium as an auto-electronic emitter Higher working stability than tungsten. e. Application to components Useful as a coating, ( U S S R ) A B Kiselev and B P Nikonov, Rhenium Problems, 1964, 193-199 (in Russian).
42. Glass, ceramics and refractory oxides 42 A study of the diffusion process in glass by subsequent devitrifieation. See abstract number 215. 42 The deposition of alumina, silica and magnesia films by electron bombardment evaporation. See Abstr. No. 269.
43. Plastics and elastomers 43 High vacuum lead-through produced by resin casting technique. See abstract number 263.
47. Outgassing data, vapour pressure data, gettering data, residual gases in vacuum systems, residual gas analysis 47 : 22 : 19 304. Investigation on the composition of the residual gas in instruments fitted with multi-layer photo cathodes. (USSR) The investigation was carried out with the help of an omegatron in which the gas Spectrum was observed before and after connection to the envelope containing the photocathode at 2-6 × 10-7 torr. The basic gaseous components present in the envelope were found to be N~, CO, CH4, Ar, Ne and He. Chemically active gases like CO, CO2, H=O and CH4 are strongly absorbed by the photocathode
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and this leads to a reduction of its sensitivity. All operations leading to an increase of the pressure of these gases in the envelope, as for example connecting it to another vessel containing these active residual gases, will lead t o a similar reduction of the sensitivity. Raising the potential of the photocell terminals in the dark (without flow of current) does not affect the gas composition appreciably. If a current is allowed to flow, the partial pressure of hydrogen and methane increases. This change is reversible. It is suggested that one of the reasons for the ageing of photo:cells is gradual poisoning by absorption of active residuals. ( U S S R ) N A Soboleva et al, Izv A k N S S S R Set Fiz, 28 (9), 1964, 14541460 (in Russian).
V. Basic science and engineering 52. Physical chemistry 52 Fibred and epitaxial growth in sputtered films of GaAs. See abstract number 283.
54. Biology, biochemistry, pharmaceutics, toxicology, organic chemistry 54 Determination of thickness and refractive index of thin films as an approach to the study of biological macro molecules. See abstract number 255.
56. Electrical engineering, electronic circuits, electrical devices 56 Multiplier phototube for the far ultraviolet. See abstract number 251.
Vl. Miscellaneous 64. Book reviews, symposia programmes and reports 64 11th conference on the physical basis of cathode electronics. See abstract number 238. 64 Investigation into electrical discharges in gases. See abstract number 239. 64 Ellipsometry in the measurement of surfaces and thin films symposium. See abstract number 288. 64 305. Proceedings of the international conference on the physics and chemistry of solid surfaces. (Netherlands) The conference was held at Brown University, Rhode Island, USA, 21-26 June 1964. The 65 papers presented range from electron and phonon transport at surfaces to atomic structure of crystal surfaces. Anon, Surface Sci, 2, 1964, 557.
42. Glass, ceramics and refractory oxides 42 A study of the diffusion process in glass by subsequent devitrifieation. See abstract number 215. 42 The deposition of alumina, silica and magnesia films by electron bombardment evaporation. See Abstr. No. 269.
43. Plastics and elastomers 43 High vacuum lead-through produced by resin casting technique. See abstract number 263.
47. Outgassing data, vapour pressure data, gettering data, residual gases in vacuum systems, residual gas analysis 47 : 22 : 19 304. Investigation on the composition of the residual gas in instruments fitted with multi-layer photo cathodes. (USSR) The investigation was carried out with the help of an omegatron in which the gas Spectrum was observed before and after connection to the envelope containing the photocathode at 2-6 × 10-7 torr. The basic gaseous components present in the envelope were found to be N~, CO, CH4, Ar, Ne and He. Chemically active gases like CO, CO2, H=O and CH4 are strongly absorbed by the photocathode
166
and this leads to a reduction of its sensitivity. All operations leading to an increase of the pressure of these gases in the envelope, as for example connecting it to another vessel containing these active residual gases, will lead t o a similar reduction of the sensitivity. Raising the potential of the photocell terminals in the dark (without flow of current) does not affect the gas composition appreciably. If a current is allowed to flow, the partial pressure of hydrogen and methane increases. This change is reversible. It is suggested that one of the reasons for the ageing of photo:cells is gradual poisoning by absorption of active residuals. ( U S S R ) N A Soboleva et al, Izv A k N S S S R Set Fiz, 28 (9), 1964, 14541460 (in Russian).
V. Basic science and engineering 52. Physical chemistry 52 Fibred and epitaxial growth in sputtered films of GaAs. See abstract number 283.
54. Biology, biochemistry, pharmaceutics, toxicology, organic chemistry 54 Determination of thickness and refractive index of thin films as an approach to the study of biological macro molecules. See abstract number 255.
56. Electrical engineering, electronic circuits, electrical devices 56 Multiplier phototube for the far ultraviolet. See abstract number 251.
Vl. Miscellaneous 64. Book reviews, symposia programmes and reports 64 11th conference on the physical basis of cathode electronics. See abstract number 238. 64 Investigation into electrical discharges in gases. See abstract number 239. 64 Ellipsometry in the measurement of surfaces and thin films symposium. See abstract number 288. 64 305. Proceedings of the international conference on the physics and chemistry of solid surfaces. (Netherlands) The conference was held at Brown University, Rhode Island, USA, 21-26 June 1964. The 65 papers presented range from electron and phonon transport at surfaces to atomic structure of crystal surfaces. Anon, Surface Sci, 2, 1964, 557.