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Coefficients of interdiffusion of hydrogen and oxygen in carbon dioxide from room temperature to -77°C
Classified abstracts 1-114 Classified abstracts 1-11 on this page
Editor's note
The label immediately following the tffle of each item denotes country or origin of publication, and that at the end of each abstract indicates country of origin of work (where known).
I. General v a c u u m s c i e n c e and e n g i n e e r i n g 13. V A C U U M A P P L I C A T I O N S 13 1. Electronic technology in Poland and its importance for economic development. (Poland) A review of research deahng with electromc technology m Poland is presented and suggestions for further development are gwen. Research on clean surfaces is conducted m the Physics Institute and Electron Technology Institute of the Polish Academy of Smences. The high vacuum department of Warsaw Technical Umverslty is concerned with objective methods of pressure measurement in the ultrahigh vacuum region. The Industrial Institute of Electromcs deals with new thermtomc cathodes on the basis of mixed oxides of barmm, strontram and calcium for high power pulsed electron tubes and low noise amphfier tubes, high vacuum technology mcludmg residual gas analysis in electron tubes, electron beam technology for heating, melting and seahng of metals, technology of metals and alloys sorbmg gases, high efficient getters and technology of vacuum-tight seals of metals, ceramics and glass. B Paszkowski, Elektronika, 11 (1), 1970, 7 12 (m Pohsh) 14. KINETIC T H E O R Y OF GASES 14 2. Coefficients of interdiffusion of hydrogen and oxygen in carbon dioxide from room temperature to 77°C. (USSR) The coefficients of lnterdiffusion of hydrogen and oxygen in carbon d~oxtde from room temperature to 77~C are measured using a stationary throughput method and compared with calculated values. The potentml function is deduced from experimental results. N D Kosov and A Zhelgasov, Zh tekh Ftz, 40 (6), June 1970, 1325-1327
(m Rusatan) 14 3. Effusion. VI. Velocity distributions of gaseous CsCI from near-ideal and non-ideal right-circular cylindrical orifices. Double oven effusion cells equipped with near-ideal and non-ideal right-circular cyhndrical orifices were used. A multiple slotted-disc velomty selector was used to determine velocity distribution. Detectors utdized surface lomzatlon. Detads of the apparatus and techtuques are given. For the near-ideal orifice, the data are m accord with the Maxwelhan velocity distribution and there is no dependence on K n u d s e n number or effusion angle. For non-ideal cyhndncal orifices, dewations from the Maxwelhan distribution occurred at low pressures under molecular flow condit~ons. They were largest at effusion angles near the axis of the orifice and were enhanced by increasing pressure in the transition region. K C Wang and P G Wahlbeck, J Chem Phys, 53 (7), 1 Oct 1970, 2896-2905. 14 4. Rotating cylinder apparatus for rarefied gas flow studies. (USA) A rotating cyhnder type apparatus is described, suitable for determining drag in cyhndrical flow of rarefied gases, and for evaluating tangential m o m e n t u m accommodation coefficients at gas-sohd boundaries. The apparatus may be used over a wide pressure range, corresponding to free molecule and continuum flow conditions. A J AIofs and G S Springer, Rev vctent lnstrum, 41 (8), 1970, 11611163 16. GASES AND SOLIDS 16 5. Boron suboxide surface layers and surface states of fl-rhombohedral boron. (Germany) i t is found that when /3-rhombohedral boron is heated in vacuum at
60
pressure of about 10 a torr to temperatures above 500 C and is then recooled, the sample properties are slgmficantly changed, It is shown that the electroconductlvity enhancement, the thermoelectric power decrease and the optical properties change are due to a chemical reaction of boron at the sample surface w~th the residual oxygen. Electron microscope investigations of surface layers taken off from the boron show the boron suboxlde formation H Werheit et al, Phys Status Sohdl (a), 2 (3), July 1970, K125-K 129 16 6. Field ion microscopical observation of a transient stage of adsorption in the Pt-H~-Ne system A new experimental technique for the direct observation of lmt~al stages of gas-surface mteractlons using a field ton microscope is described. Experiments with hydrogen on platinum indicate that at 21 °K the adsorbate first assumes a metastable state and then a stable adsorption state. The observed transition probabdlties from the metastable state to the stable state are 0.15/msec for adsorbed hydrogen around the (134) planes, and 0.28/msec around the (012) planes. O Nishikawa, J Chem Phys, 53 (5), I Sept 1970, 1978-1986. 16 7. T a m m states in semiconductors. (USSR) T a m m surface states in semiconductors play a fundamental role m gas chem~sorptlon on semiconductor surfaces. Basic equations for the determination of T a m m surface states on semiconductors are obtained. V E Stepanov and V A Chaldyshev, Fiz Tverd Tela, 12 (6), June 1970, 1671-1677 (m Russian) 16 8. Theory concerning the interaction of an alkali atom and a metallic surface The theory developed shows that an alkah atom causes both a shift and a broadening of the valence level of the atom. The theoretical model is presented and then the shift and broadening are calculated using perturbation theory. Results are computed for the adsorption of cesmm on tungsten and h t h m m on rhemum. M Remy, J Chem Phys, 53 (6), 15 Sept t970, 2487-2491 16 9. Characteristic electron energy loss spectrum in tungsten single crystals. (USSR) Experimental invest~gation of the energy loss spectrum of electrons reflected with characteristic energy losses from tungsten single crystals Is carried out using a method of electronic dtfferentmhon with the aid of a phase sensitive detector. Surface and volume plasma oscdlattons, and interband transitions, are discussed. V V Korablev, Fiz Tverd Tela, 12 (6), June 1970, 1638-1640 (m
Ruvsian). 16 10. Quantum mechanical basis for the cubes models in gas-surface scattering theory and an experimental test. It ts suggested that there is a q u a n t u m mechamcal basis for the classical flat surface (cubes) models of gas-surface scattering, the important characteristic of which is the assumption of conservation of tangentml m o m e n t u m of a scattering gas molecule. The theory is apphed to the diffractive system He h F . Agreement is reached with exlstmg experimental data F O Goodman, J Chem Phw, 53 (8), 15 Sept 1970, 2281-2283. 16 11. Dechannelling of fast ions at dislocations. (Germany) The probabdtty of a channelled ion being knocked into a random trajectory as a result of lattice distortion near a dislocation is mvesU-
Editor's note
The label immediately following the tffle of each item denotes country or origin of publication, and that at the end of each abstract indicates country of origin of work (where known).
I. General v a c u u m s c i e n c e and e n g i n e e r i n g 13. V A C U U M A P P L I C A T I O N S 13 1. Electronic technology in Poland and its importance for economic development. (Poland) A review of research deahng with electromc technology m Poland is presented and suggestions for further development are gwen. Research on clean surfaces is conducted m the Physics Institute and Electron Technology Institute of the Polish Academy of Smences. The high vacuum department of Warsaw Technical Umverslty is concerned with objective methods of pressure measurement in the ultrahigh vacuum region. The Industrial Institute of Electromcs deals with new thermtomc cathodes on the basis of mixed oxides of barmm, strontram and calcium for high power pulsed electron tubes and low noise amphfier tubes, high vacuum technology mcludmg residual gas analysis in electron tubes, electron beam technology for heating, melting and seahng of metals, technology of metals and alloys sorbmg gases, high efficient getters and technology of vacuum-tight seals of metals, ceramics and glass. B Paszkowski, Elektronika, 11 (1), 1970, 7 12 (m Pohsh) 14. KINETIC T H E O R Y OF GASES 14 2. Coefficients of interdiffusion of hydrogen and oxygen in carbon dioxide from room temperature to 77°C. (USSR) The coefficients of lnterdiffusion of hydrogen and oxygen in carbon d~oxtde from room temperature to 77~C are measured using a stationary throughput method and compared with calculated values. The potentml function is deduced from experimental results. N D Kosov and A Zhelgasov, Zh tekh Ftz, 40 (6), June 1970, 1325-1327
(m Rusatan) 14 3. Effusion. VI. Velocity distributions of gaseous CsCI from near-ideal and non-ideal right-circular cylindrical orifices. Double oven effusion cells equipped with near-ideal and non-ideal right-circular cyhndrical orifices were used. A multiple slotted-disc velomty selector was used to determine velocity distribution. Detectors utdized surface lomzatlon. Detads of the apparatus and techtuques are given. For the near-ideal orifice, the data are m accord with the Maxwelhan velocity distribution and there is no dependence on K n u d s e n number or effusion angle. For non-ideal cyhndncal orifices, dewations from the Maxwelhan distribution occurred at low pressures under molecular flow condit~ons. They were largest at effusion angles near the axis of the orifice and were enhanced by increasing pressure in the transition region. K C Wang and P G Wahlbeck, J Chem Phys, 53 (7), 1 Oct 1970, 2896-2905. 14 4. Rotating cylinder apparatus for rarefied gas flow studies. (USA) A rotating cyhnder type apparatus is described, suitable for determining drag in cyhndrical flow of rarefied gases, and for evaluating tangential m o m e n t u m accommodation coefficients at gas-sohd boundaries. The apparatus may be used over a wide pressure range, corresponding to free molecule and continuum flow conditions. A J AIofs and G S Springer, Rev vctent lnstrum, 41 (8), 1970, 11611163 16. GASES AND SOLIDS 16 5. Boron suboxide surface layers and surface states of fl-rhombohedral boron. (Germany) i t is found that when /3-rhombohedral boron is heated in vacuum at
60
pressure of about 10 a torr to temperatures above 500 C and is then recooled, the sample properties are slgmficantly changed, It is shown that the electroconductlvity enhancement, the thermoelectric power decrease and the optical properties change are due to a chemical reaction of boron at the sample surface w~th the residual oxygen. Electron microscope investigations of surface layers taken off from the boron show the boron suboxlde formation H Werheit et al, Phys Status Sohdl (a), 2 (3), July 1970, K125-K 129 16 6. Field ion microscopical observation of a transient stage of adsorption in the Pt-H~-Ne system A new experimental technique for the direct observation of lmt~al stages of gas-surface mteractlons using a field ton microscope is described. Experiments with hydrogen on platinum indicate that at 21 °K the adsorbate first assumes a metastable state and then a stable adsorption state. The observed transition probabdlties from the metastable state to the stable state are 0.15/msec for adsorbed hydrogen around the (134) planes, and 0.28/msec around the (012) planes. O Nishikawa, J Chem Phys, 53 (5), I Sept 1970, 1978-1986. 16 7. T a m m states in semiconductors. (USSR) T a m m surface states in semiconductors play a fundamental role m gas chem~sorptlon on semiconductor surfaces. Basic equations for the determination of T a m m surface states on semiconductors are obtained. V E Stepanov and V A Chaldyshev, Fiz Tverd Tela, 12 (6), June 1970, 1671-1677 (m Russian) 16 8. Theory concerning the interaction of an alkali atom and a metallic surface The theory developed shows that an alkah atom causes both a shift and a broadening of the valence level of the atom. The theoretical model is presented and then the shift and broadening are calculated using perturbation theory. Results are computed for the adsorption of cesmm on tungsten and h t h m m on rhemum. M Remy, J Chem Phys, 53 (6), 15 Sept t970, 2487-2491 16 9. Characteristic electron energy loss spectrum in tungsten single crystals. (USSR) Experimental invest~gation of the energy loss spectrum of electrons reflected with characteristic energy losses from tungsten single crystals Is carried out using a method of electronic dtfferentmhon with the aid of a phase sensitive detector. Surface and volume plasma oscdlattons, and interband transitions, are discussed. V V Korablev, Fiz Tverd Tela, 12 (6), June 1970, 1638-1640 (m
Ruvsian). 16 10. Quantum mechanical basis for the cubes models in gas-surface scattering theory and an experimental test. It ts suggested that there is a q u a n t u m mechamcal basis for the classical flat surface (cubes) models of gas-surface scattering, the important characteristic of which is the assumption of conservation of tangentml m o m e n t u m of a scattering gas molecule. The theory is apphed to the diffractive system He h F . Agreement is reached with exlstmg experimental data F O Goodman, J Chem Phw, 53 (8), 15 Sept 1970, 2281-2283. 16 11. Dechannelling of fast ions at dislocations. (Germany) The probabdtty of a channelled ion being knocked into a random trajectory as a result of lattice distortion near a dislocation is mvesU-