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1227. Surface diffusion in microporous media
Classified
abstracts
1225-1240 16
1225. Change of Ti film resistance
under argon
ion bombardment.
L Ju Abramovich, (in Russian).
et al, Zh Tekh Fiz, 36 (4), Apr 1966,
714-719,
(USSR)
18
Increase of Ti film resistance due to the sorption of Ar ions was studied. This change reaches a maximum of about 1,5 per cent for Ar ion energies 2-3 keV. (USSR) G F Ivanovsky and T D Radzhabov, 1271-1273, (in Russian).
Fir Tverd Tela, 8 (4), Apr
1226. On light atom passage through heavy element layers.
1966,
16 (USSR)
The passage of a beam of light atoms or their middle-energy ions through a heavy metal amorphous layer was studied. An experimental verification is given. (USSR) L D Tsendin, Fiz Tverd Tela, 8 (4), Apr 1966, 1202-1207, 1227. Surface diffusion in microporous
(in Russian).
26
media.
16
Interface
Science, 21, April 1966, 415-434.
16 surfaces. et al, J Colloid and Interface Science,
(USA) 21, April 1966,
1230. Sorption of hydrogen and oxygen by cadmium oxide.
16 (Canada)
The sorptions of Hz and 0, on freshly prepared and on gas-treated Cd0 were measured from 0-250°C. The data suggest that H, chemisorption predominates near 26”, where it is the precursor of water formed on the surface. MJDLowandAMKamel,
CanJChem,44(10),
1966, I147-1152.
16 1231. The processes involved in the adsorption of oxygen on brown coal char. (USA)
Experimental evidence is found to suggest two concurrent adsorption processes: (a) a reversible adsorption process which rapidly achieves equilibrium coverage; the adsorbed oxygen can be desorbed by evacuation, and (b) a continuous irreversible adsorption whose rate decreased over the experimental period. D J Allardice, Carbon, 3 (2), 1965, 214-218. 16:22 1232. Experimental device for ion sorption studies. (Rumania) A new type of ion sorption tube is described. The tube was built for the study of the temperature dependance of the ion pumping action. In the tube constructed for this study the region where the electrons are generated is distinct from that where the ions are produced. The ions are accelerated towards the glass wall, whose temperature is stabilized by means of a thermostat. The glowing filament is remote and screened from the region where the accelerating grid is placed. The construction permits highly accurate determination and control of the temperature of the adsorbing glass wall. Preliminary results, showing the existence of a discrete spectrum of adsorption sites on glass, are presented. A Cavaleru, (in English).
18. Gaseous
et al, Revue Roumaine
B N Klarfeld, Russian).
et al, Zh Tekh Fiz, 36 (4),
Apr
1966,
704-713,
de Physique,
IO (S),
1965,
839,
electronics
18 1233. An ultra high density glow discharge
(in
1235. Measurements of attachment in oxygen and air. (USSR)
coefficient of thermalized
electrons
An attachment coefficient was measured by an attenuation of VHF signals in plasma at pressures 3 to 30 torr (oxygen) and 15 to 150 torr (air). In the appendix the influence of the recombination on the (USSR) measurement error was calculated. V B Brodskii and S E Zagik, Zh Tekh Fir, 36 (4), Apr 1966,6 (in Russian).
72-6 78,
18
1229. Physical adsorption on heterogeneous A W Adamson, 445-457.
up to
Present-day ‘terminblogy of different types of glow discharge is discussed and it is proposed to divide the glow discharge at a left branch of Paschen’s curve into 3 tvues: “simule”, “normal” and “high density”. This new classificat&i is analised ‘in detail. As an experimental basis for this discussion detailed measurements of discharges in Hz, N,, Ne and Ar at voltages up to 30 kV, currents in the range lo+’ to 10 A and pressures 2.5 x 10m2to 15 torr are presented. (USSR)
(USA)
The ability of a sorbent to produce high vacuum depends upon the accessible area it presents and upon the affinity it shows for the gases which are to he removed. There are various sorberts of high area which in certain cases can be relatively selective. Specificity of a given sorbent can also be modified by chemical treatments or by cation exchange and by decationization. R M Barrer, J Colloidand
and current densities
18
82-89. in physical sorption.
at a low pressure
(Canada)
The surface diffusion of He, Ne, HZ, Ar, OS, Ne and CO, through Vycor microporous glass was analyzed theoretically and experimentally in the low pressure range as a function of temperature. A statistical-mechanical treatment was carried out in terms of partition functions to derive a general equilibrium of surface flow. S Hwang and K Kammermeyer, Can J Chem Eng, 44, April 1966, 1228. Specificity
1234. Glow discharge 0.1 A/cm2. (USSR)
1236. Striking (USSR)
of a discharge
in a Penning
tube at high vacuum.
Conditions of a discharge arcing were calculated as the first approximation of Townsend’s theory. By this method the striking function H=f(V3 was calculated and verified by some experiments at pressures lo+ to lo-’ torr. The influence of the electrode degassing was also studied. (USSR). E M Reikhrudel and E Kh Isakaev, Zh Tekh Fiz, 36 (4), Apr 1966, 651-660, (in Russian), 18 1237. Desorption mechanism of electric breakdown in high vacuum. (USSR)
This paper contains a description of following mechanism, initiating vacuum breakdown: high voltage affects the desorption from the electrode surface and high gradient in this cloud of neutral molecules and ions initiates the breakdown. The classification of different initiating mechanisms in various conditions is also discussed. (USSR) L V Tarasova, Dokl Akad 330-333, (in Russian).
Nauk SSSR,
167 (2), March
II,
1966,
18 1238. Self-contained discharge current in a high vacuum electrical and magnetic fields. (USSR)
in crossed
A theoretical analysis of a self-contained discharge gives accurate results only with respect to non-uniform formation of a space charge. Experimental verification for the lo+ to 1OmBtorr range is described. (USSR) E M Reikhrudel and E P Sheretov, March 1966, 532-535, (in Russian).
Radiotekh
elektron,
1239. The role of positive ions in high voltage breakdown WW
II
(3),
18 in vacuum.
Targets of aluminium, steel, magnesium, copper, gold and lead were bombarded by ions of hydrogen, helium, nitrogen, xenon and mercury and the electron emission measured. The ions, with energies ranging from 10 to 140 kV, were produced by ionization of the residual gas in the anode electrode and emerged through a small opening into an essentially uniform accelerating field. The electron emission rose rapidly with ion energy, initially, followed by a slow linear increase. Emission ratio varied from 2 to 20 and was maximum for nitrogen ions on steel. No simple dependence on the nature of the ion or on the bombarded metal was observed. The significance of the data with respect to the electron-ion interaction theory of high voltage breakdown in vacuum is discussed. H C Boume et al, US Govt Res Develop Repts, 41 (4), 25 Feb 1966, Supplp45,
PB-168912,
17pages.
with a hollow cathode.
18
(USSR)
1240. Plasma oscillations.
A glow discharge with current densities up to 50 Acme2 was studied in H,, He, Ne and Ar at pressures 5x lo+ to 1 torr. At higher densities this discharge changes into an arc. (USSR)
Spontaneous oscillation of plasmas maintained by low voltage electron beams in gas at pressure of about low3 torr was investigated. Previous work on oscillations in the plasma electron band (frequency
452
(USA)
abstracts
1225-1240 16
1225. Change of Ti film resistance
under argon
ion bombardment.
L Ju Abramovich, (in Russian).
et al, Zh Tekh Fiz, 36 (4), Apr 1966,
714-719,
(USSR)
18
Increase of Ti film resistance due to the sorption of Ar ions was studied. This change reaches a maximum of about 1,5 per cent for Ar ion energies 2-3 keV. (USSR) G F Ivanovsky and T D Radzhabov, 1271-1273, (in Russian).
Fir Tverd Tela, 8 (4), Apr
1226. On light atom passage through heavy element layers.
1966,
16 (USSR)
The passage of a beam of light atoms or their middle-energy ions through a heavy metal amorphous layer was studied. An experimental verification is given. (USSR) L D Tsendin, Fiz Tverd Tela, 8 (4), Apr 1966, 1202-1207, 1227. Surface diffusion in microporous
(in Russian).
26
media.
16
Interface
Science, 21, April 1966, 415-434.
16 surfaces. et al, J Colloid and Interface Science,
(USA) 21, April 1966,
1230. Sorption of hydrogen and oxygen by cadmium oxide.
16 (Canada)
The sorptions of Hz and 0, on freshly prepared and on gas-treated Cd0 were measured from 0-250°C. The data suggest that H, chemisorption predominates near 26”, where it is the precursor of water formed on the surface. MJDLowandAMKamel,
CanJChem,44(10),
1966, I147-1152.
16 1231. The processes involved in the adsorption of oxygen on brown coal char. (USA)
Experimental evidence is found to suggest two concurrent adsorption processes: (a) a reversible adsorption process which rapidly achieves equilibrium coverage; the adsorbed oxygen can be desorbed by evacuation, and (b) a continuous irreversible adsorption whose rate decreased over the experimental period. D J Allardice, Carbon, 3 (2), 1965, 214-218. 16:22 1232. Experimental device for ion sorption studies. (Rumania) A new type of ion sorption tube is described. The tube was built for the study of the temperature dependance of the ion pumping action. In the tube constructed for this study the region where the electrons are generated is distinct from that where the ions are produced. The ions are accelerated towards the glass wall, whose temperature is stabilized by means of a thermostat. The glowing filament is remote and screened from the region where the accelerating grid is placed. The construction permits highly accurate determination and control of the temperature of the adsorbing glass wall. Preliminary results, showing the existence of a discrete spectrum of adsorption sites on glass, are presented. A Cavaleru, (in English).
18. Gaseous
et al, Revue Roumaine
B N Klarfeld, Russian).
et al, Zh Tekh Fiz, 36 (4),
Apr
1966,
704-713,
de Physique,
IO (S),
1965,
839,
electronics
18 1233. An ultra high density glow discharge
(in
1235. Measurements of attachment in oxygen and air. (USSR)
coefficient of thermalized
electrons
An attachment coefficient was measured by an attenuation of VHF signals in plasma at pressures 3 to 30 torr (oxygen) and 15 to 150 torr (air). In the appendix the influence of the recombination on the (USSR) measurement error was calculated. V B Brodskii and S E Zagik, Zh Tekh Fir, 36 (4), Apr 1966,6 (in Russian).
72-6 78,
18
1229. Physical adsorption on heterogeneous A W Adamson, 445-457.
up to
Present-day ‘terminblogy of different types of glow discharge is discussed and it is proposed to divide the glow discharge at a left branch of Paschen’s curve into 3 tvues: “simule”, “normal” and “high density”. This new classificat&i is analised ‘in detail. As an experimental basis for this discussion detailed measurements of discharges in Hz, N,, Ne and Ar at voltages up to 30 kV, currents in the range lo+’ to 10 A and pressures 2.5 x 10m2to 15 torr are presented. (USSR)
(USA)
The ability of a sorbent to produce high vacuum depends upon the accessible area it presents and upon the affinity it shows for the gases which are to he removed. There are various sorberts of high area which in certain cases can be relatively selective. Specificity of a given sorbent can also be modified by chemical treatments or by cation exchange and by decationization. R M Barrer, J Colloidand
and current densities
18
82-89. in physical sorption.
at a low pressure
(Canada)
The surface diffusion of He, Ne, HZ, Ar, OS, Ne and CO, through Vycor microporous glass was analyzed theoretically and experimentally in the low pressure range as a function of temperature. A statistical-mechanical treatment was carried out in terms of partition functions to derive a general equilibrium of surface flow. S Hwang and K Kammermeyer, Can J Chem Eng, 44, April 1966, 1228. Specificity
1234. Glow discharge 0.1 A/cm2. (USSR)
1236. Striking (USSR)
of a discharge
in a Penning
tube at high vacuum.
Conditions of a discharge arcing were calculated as the first approximation of Townsend’s theory. By this method the striking function H=f(V3 was calculated and verified by some experiments at pressures lo+ to lo-’ torr. The influence of the electrode degassing was also studied. (USSR). E M Reikhrudel and E Kh Isakaev, Zh Tekh Fiz, 36 (4), Apr 1966, 651-660, (in Russian), 18 1237. Desorption mechanism of electric breakdown in high vacuum. (USSR)
This paper contains a description of following mechanism, initiating vacuum breakdown: high voltage affects the desorption from the electrode surface and high gradient in this cloud of neutral molecules and ions initiates the breakdown. The classification of different initiating mechanisms in various conditions is also discussed. (USSR) L V Tarasova, Dokl Akad 330-333, (in Russian).
Nauk SSSR,
167 (2), March
II,
1966,
18 1238. Self-contained discharge current in a high vacuum electrical and magnetic fields. (USSR)
in crossed
A theoretical analysis of a self-contained discharge gives accurate results only with respect to non-uniform formation of a space charge. Experimental verification for the lo+ to 1OmBtorr range is described. (USSR) E M Reikhrudel and E P Sheretov, March 1966, 532-535, (in Russian).
Radiotekh
elektron,
1239. The role of positive ions in high voltage breakdown WW
II
(3),
18 in vacuum.
Targets of aluminium, steel, magnesium, copper, gold and lead were bombarded by ions of hydrogen, helium, nitrogen, xenon and mercury and the electron emission measured. The ions, with energies ranging from 10 to 140 kV, were produced by ionization of the residual gas in the anode electrode and emerged through a small opening into an essentially uniform accelerating field. The electron emission rose rapidly with ion energy, initially, followed by a slow linear increase. Emission ratio varied from 2 to 20 and was maximum for nitrogen ions on steel. No simple dependence on the nature of the ion or on the bombarded metal was observed. The significance of the data with respect to the electron-ion interaction theory of high voltage breakdown in vacuum is discussed. H C Boume et al, US Govt Res Develop Repts, 41 (4), 25 Feb 1966, Supplp45,
PB-168912,
17pages.
with a hollow cathode.
18
(USSR)
1240. Plasma oscillations.
A glow discharge with current densities up to 50 Acme2 was studied in H,, He, Ne and Ar at pressures 5x lo+ to 1 torr. At higher densities this discharge changes into an arc. (USSR)
Spontaneous oscillation of plasmas maintained by low voltage electron beams in gas at pressure of about low3 torr was investigated. Previous work on oscillations in the plasma electron band (frequency
452
(USA)