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2175. Nonlinear interactions of waves in plasma waveguide
Classified abstracts 2168-2183 12 2168. Features of luminescence of crystals of lead halide salts at electron excitation. (USSR) Luminescence spectra of PbC12 and PbBr2 crystals, grown by the Stockbarger method in vacuum, is investigated in a vacuum of 10 -7 torr at irradiation by electrons with energies ranging from 3.5 to 10 keV. I L Kuusmann et al, Fiz Tverd Tela, 17 (6), 1975, 1854-1856 (in
Russian). 12 2169. Spectral investigation of secondary emission of excited atoms at bombardment of tantalum and molybdenum with caesium ions. (USSR) Radiation emitted at bombardment of tantalum and molybdenum by caesium ions with an energy of 3 keV and current density of 1 × 10 -4 A/cm 2 is investigated. The lines of excited Cs and Ta atoms and continuous spectrum are found. S F Belykh et al, Fiz Tverd Tela, 17 (6), 1975, 1852-1853 (in Russian). 12 2170. Features of ejecting electrons from metals by slow molecular ions. (USSR) A comparative study of ion-electron emission has been performed. The (110) face of single crystal copper was used as a target. The target was cleaned by heating at 1000°C and by ion etching in argon. The cleanliness of target surface was checked by measurement of the threshold potential for secondary electron emission due to helium and argon ions. All measurements have been performed at target temperature 1000°C. It is found that the yield factor for all examined molecular ions H2 + , H3 + , He +, Nz +, 02 +, OH +, H20 +, CO +, CO2 + at energies below 1 to 1.6 keV is considerably lower than that for atomic ions (H +, He +, N +, O + , Ar+). The yield factor is also measured for doubly charged ions of argon and carbon monoxide. The causes for the low yield of ion-electron emission for slow molecular ions are discussed. A A Dorozhkin et al, Fiz Tverd Tela, 17 (6), 1975, 1848-1850 (in
Russian). 12 2171. On the mechanism of secondary ion emission. (USSR) The processes are discussed which influence the charge state of secondary particles at sputtering. The probability of formation of secondary negative hydrogen ions is calculated. M E Kishinevskiy, Zh Tekh Fiz, 45 (6), 1975, 1281-1283 (in Russian) 12 2172. To the theory of ion field emission high-current diode. (USSR) The Poisson equation for a plane diode is considered together with the equation for field ion emission to obtain theoretical volt-ampere characteristic of the ion field emission diode. The obtained characteristic enables one to determine the limiting current density in the diode. B I Ivanov, Transact of3rd Ukrain Republ Confon Electron Optics and Appl, Vol 1, Kharkov 1974, 158-159 (in Russian). 12 2173. Population of atomic states 1So, 1D2 and 3po,1,2 at pulsed photoiysis of selenium and tellurium molecules. (USSR) Using the method of absorption of atomic selenium and tellurium spectrum, population of atomic states 1So, 1D2 and 3Po,~,2 of selenium and tellurium at pulsed photolysis is investigated at vapour pressures of 1 to 3 torr in a cell. A P Ubelis and Yn A Silinsh, Optika Spektroskop, 38 (3), 1975, 479485 (in Russian). 12 2174. Excitation of potassium and caesium atoms by electron impact to ion states. (USSR) Using the method of crossing electron and atom beams, the process of excitation of discrete ionic states of potassium and caesium at electron-atom collisions is investigated. The excitation functions of ionic states are measured in the electron energy range from threshold to 300 eV. E N Postoy et al, Optika Spektroskop, 38 (3), 1975, 465-471 (in
Russian), 12 2175. Nonlinear interaction of waves in plasma waveguide. (USSR) Nonlinear interaction of electromagnetic waves, propagated in a plasma waveguide, is studied both theoretically and experimentally. The hot-cathode discharge was excited in mercury vapours at a pressure of 2 × 10 -3 torr. N S Baranchuk et al, Zh Tekh Fiz, 45 (4), 1975, 751-758 (in Russian).
12 2176. Nonlinear interaction of a modulated beam with plasma. (Czechoslovakia) Theoretical and experimental results concerning the nonlinear interaction of an initially cold electron beam with an externally produced magnetized plasma are discussed. A beam plasma machine pumped to a background pressure of 10 -7 torr is described. Neutral gas pressure in the interaction zone of 7 × 10 -5 to 5 × 10 -4 torr was used. Only the Cerenkov type of excitation of the upper branch of electron plasma oscillations has been observed. P Sunka and K Jungwirth, Czech JPhys, B25 (4), 1975, 404-429. 12 2177. Measurement of energy characteristics and ion emission of spark of slipping discharge in vacuum. (USSR) Energy of the spark, velocity of plasma motion and volt-ampere characteristics of an ion source based on electric discharge on surface of dielectric in vacuum are measured. Experimental results are discussed. V G Shpak, Izv VUZFiz, No 4, 1975, 131-133 (in Russian). 12 2178. Motion of electrons and structure of anode layer at disturbance of perpendicularity of electric and magnetic fields in a low-pressure discharge. (USSR) Motion of electrons and structure of anode layer at disturbance of perpendicularity of electric and magnetic fields in a low-pressure discharge are studied both theoretically and experimentally. The experiments were performed in an inverted magnetron at argon pressures ranging from 3 × 10 - s to 5 × 10 -4 tort. N A Kervalishvili et al, Zh Tekh Fiz, 45 (4), 1975, 811-819 (in Russian). 12 2179. Double electric layers in direct discharge. (USSR) It is shown that a double electric layer can be formed in the direct discharge. A high-current electron beam can be generated in the double electric layer of the direct discharge. The direct discharge was excited in a highly ionized plasma of hydrogen, argon or air at pressures ranging from 2 × 10 -5 to 5 x 10 -5 torr by injection of a low-current electron beam. E I Lutsenko et al, Zh Tekh Fiz, 45 (4), 1975, 789-796 (in Russian). 12 2180. Investigation of stationary ultrahigh frequency discharge excited in the diffusion regime. (USSR) The electric field intensity, radial distribution of concentration and average electron energy are measured in a stationary ultrahigh frequency discharge in helium at pressures ranging from 5 × 10-1 to 10 torr. A I Maksimov et al, Zh Tekh Fiz, 45 (4), 1975, 783-788 (in Russian). 12 2181. Experimental investigation of parametric excitation of lowfrequency plasma oscillations in magnetic field. (USSR) Parametric instability of magnetoactive plasma in space-periodic high frequency field is investigated. The high-frequency discharge was excited in a ceramic tube filled with helium, air or argon to pressures ranging from 5 × 10 -4 to 5 × 10 -3 torr. L L Pasechnik and V F Semenyuk, Zh Tekh Fiz, 45 (4), 1975, 779-782
(in Russian). 12 2182. On cyclotron heating of plasma electrons. II. (USSR) The mechanism of interaction of plasma with a high-frequency field is investigated at conditions of electron cyclotron resonance. The experiments with an argon plasma beam from a Penning source were performed in a vacuum chamber at residual gas pressure less than 7 × 1 0 - ' tort. It is shown that the relativistic theory of electron cyclotron resonance agrees well with the experimental results obtained even at relatively low high-frequency power. A A Balmashnov and K S Golovanivskiy, Zh Tekh Fiz, 45 (4), 1975, 771-775 (in Russian). 12 2183. Compression of plasma in Tuman-2 equipment. (USSR) Experiments on heating of plasma in the Tuman-2 equipment by passage of current and by adiabatic compression have been performed. The vacuum chamber was evacuated to 3 x 10 -7 tort and the experiments were performed at hydrogen pressure of 8 x 1 0 - '
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Russian). 12 2169. Spectral investigation of secondary emission of excited atoms at bombardment of tantalum and molybdenum with caesium ions. (USSR) Radiation emitted at bombardment of tantalum and molybdenum by caesium ions with an energy of 3 keV and current density of 1 × 10 -4 A/cm 2 is investigated. The lines of excited Cs and Ta atoms and continuous spectrum are found. S F Belykh et al, Fiz Tverd Tela, 17 (6), 1975, 1852-1853 (in Russian). 12 2170. Features of ejecting electrons from metals by slow molecular ions. (USSR) A comparative study of ion-electron emission has been performed. The (110) face of single crystal copper was used as a target. The target was cleaned by heating at 1000°C and by ion etching in argon. The cleanliness of target surface was checked by measurement of the threshold potential for secondary electron emission due to helium and argon ions. All measurements have been performed at target temperature 1000°C. It is found that the yield factor for all examined molecular ions H2 + , H3 + , He +, Nz +, 02 +, OH +, H20 +, CO +, CO2 + at energies below 1 to 1.6 keV is considerably lower than that for atomic ions (H +, He +, N +, O + , Ar+). The yield factor is also measured for doubly charged ions of argon and carbon monoxide. The causes for the low yield of ion-electron emission for slow molecular ions are discussed. A A Dorozhkin et al, Fiz Tverd Tela, 17 (6), 1975, 1848-1850 (in
Russian). 12 2171. On the mechanism of secondary ion emission. (USSR) The processes are discussed which influence the charge state of secondary particles at sputtering. The probability of formation of secondary negative hydrogen ions is calculated. M E Kishinevskiy, Zh Tekh Fiz, 45 (6), 1975, 1281-1283 (in Russian) 12 2172. To the theory of ion field emission high-current diode. (USSR) The Poisson equation for a plane diode is considered together with the equation for field ion emission to obtain theoretical volt-ampere characteristic of the ion field emission diode. The obtained characteristic enables one to determine the limiting current density in the diode. B I Ivanov, Transact of3rd Ukrain Republ Confon Electron Optics and Appl, Vol 1, Kharkov 1974, 158-159 (in Russian). 12 2173. Population of atomic states 1So, 1D2 and 3po,1,2 at pulsed photoiysis of selenium and tellurium molecules. (USSR) Using the method of absorption of atomic selenium and tellurium spectrum, population of atomic states 1So, 1D2 and 3Po,~,2 of selenium and tellurium at pulsed photolysis is investigated at vapour pressures of 1 to 3 torr in a cell. A P Ubelis and Yn A Silinsh, Optika Spektroskop, 38 (3), 1975, 479485 (in Russian). 12 2174. Excitation of potassium and caesium atoms by electron impact to ion states. (USSR) Using the method of crossing electron and atom beams, the process of excitation of discrete ionic states of potassium and caesium at electron-atom collisions is investigated. The excitation functions of ionic states are measured in the electron energy range from threshold to 300 eV. E N Postoy et al, Optika Spektroskop, 38 (3), 1975, 465-471 (in
Russian), 12 2175. Nonlinear interaction of waves in plasma waveguide. (USSR) Nonlinear interaction of electromagnetic waves, propagated in a plasma waveguide, is studied both theoretically and experimentally. The hot-cathode discharge was excited in mercury vapours at a pressure of 2 × 10 -3 torr. N S Baranchuk et al, Zh Tekh Fiz, 45 (4), 1975, 751-758 (in Russian).
12 2176. Nonlinear interaction of a modulated beam with plasma. (Czechoslovakia) Theoretical and experimental results concerning the nonlinear interaction of an initially cold electron beam with an externally produced magnetized plasma are discussed. A beam plasma machine pumped to a background pressure of 10 -7 torr is described. Neutral gas pressure in the interaction zone of 7 × 10 -5 to 5 × 10 -4 torr was used. Only the Cerenkov type of excitation of the upper branch of electron plasma oscillations has been observed. P Sunka and K Jungwirth, Czech JPhys, B25 (4), 1975, 404-429. 12 2177. Measurement of energy characteristics and ion emission of spark of slipping discharge in vacuum. (USSR) Energy of the spark, velocity of plasma motion and volt-ampere characteristics of an ion source based on electric discharge on surface of dielectric in vacuum are measured. Experimental results are discussed. V G Shpak, Izv VUZFiz, No 4, 1975, 131-133 (in Russian). 12 2178. Motion of electrons and structure of anode layer at disturbance of perpendicularity of electric and magnetic fields in a low-pressure discharge. (USSR) Motion of electrons and structure of anode layer at disturbance of perpendicularity of electric and magnetic fields in a low-pressure discharge are studied both theoretically and experimentally. The experiments were performed in an inverted magnetron at argon pressures ranging from 3 × 10 - s to 5 × 10 -4 tort. N A Kervalishvili et al, Zh Tekh Fiz, 45 (4), 1975, 811-819 (in Russian). 12 2179. Double electric layers in direct discharge. (USSR) It is shown that a double electric layer can be formed in the direct discharge. A high-current electron beam can be generated in the double electric layer of the direct discharge. The direct discharge was excited in a highly ionized plasma of hydrogen, argon or air at pressures ranging from 2 × 10 -5 to 5 x 10 -5 torr by injection of a low-current electron beam. E I Lutsenko et al, Zh Tekh Fiz, 45 (4), 1975, 789-796 (in Russian). 12 2180. Investigation of stationary ultrahigh frequency discharge excited in the diffusion regime. (USSR) The electric field intensity, radial distribution of concentration and average electron energy are measured in a stationary ultrahigh frequency discharge in helium at pressures ranging from 5 × 10-1 to 10 torr. A I Maksimov et al, Zh Tekh Fiz, 45 (4), 1975, 783-788 (in Russian). 12 2181. Experimental investigation of parametric excitation of lowfrequency plasma oscillations in magnetic field. (USSR) Parametric instability of magnetoactive plasma in space-periodic high frequency field is investigated. The high-frequency discharge was excited in a ceramic tube filled with helium, air or argon to pressures ranging from 5 × 10 -4 to 5 × 10 -3 torr. L L Pasechnik and V F Semenyuk, Zh Tekh Fiz, 45 (4), 1975, 779-782
(in Russian). 12 2182. On cyclotron heating of plasma electrons. II. (USSR) The mechanism of interaction of plasma with a high-frequency field is investigated at conditions of electron cyclotron resonance. The experiments with an argon plasma beam from a Penning source were performed in a vacuum chamber at residual gas pressure less than 7 × 1 0 - ' tort. It is shown that the relativistic theory of electron cyclotron resonance agrees well with the experimental results obtained even at relatively low high-frequency power. A A Balmashnov and K S Golovanivskiy, Zh Tekh Fiz, 45 (4), 1975, 771-775 (in Russian). 12 2183. Compression of plasma in Tuman-2 equipment. (USSR) Experiments on heating of plasma in the Tuman-2 equipment by passage of current and by adiabatic compression have been performed. The vacuum chamber was evacuated to 3 x 10 -7 tort and the experiments were performed at hydrogen pressure of 8 x 1 0 - '
493