2 edition of Emission of negative ions from oxide-coated cathodes. found in the catalog.
Emission of negative ions from oxide-coated cathodes.
Cyril Stanley Watt
Written in English
Thesis (Ph.D.)--The Queen"s University of Belfast, 1942.
|The Physical Object|
A brief introduction to electron and ion sources for particle accelerators is given. Concentrating on the basic processes for the production of these particles, thermionic and photocathode production of electrons and the processes in Penning and electron cyclotron resonance ion sources are covered. Finally, negative ions are by: 4. In addition, by analyzing the electrochemical performance of P2 and O3 Na-ion cathodes, we find that O3-type cathodes usually show a higher Na storage capacity than P2-type cathodes in a stable voltage window of – V, which is most likely related to the larger initial Na composition (x = 1) of the : Chenglong Zhao, Zhenpeng Yao, Qidi Wang, Haifeng Li, Jianlin Wang, Ming Liu, Swapna Ganapathy, Yaxia.
Kern, H. E., "Research on Oxide-Coated Cathodes," Bell Laboratories Record, pp. , December Kohl, Walter H., "Handbook of Materials and Techniques for Vacuum Devices," American Institute of Physics Press reprint , Isbn Chap "Cathodes and Heaters", pp Papers cited here go into the rat tube paper. Hot cathodes typically achieve much higher power density than cold cathodes, emitting significantly more electrons from the same surface area. Cold cathodes rely on field electron emission or secondary electron emission from positive ion bombardment, and do not require heating. There are two types of hot cathode.
Abstract. This paper surveys recent work on the oxide cathode. This work points to a physical model of the oxide cathode in which (1) current is carried through the cathode by semiconduction through the oxide and by pore conduction through the interstices between oxide particles, (2) both conduction process are controlled by the properties of the semiconducting oxide, (3) the oxide is Cited by: 5. In its broadest meaning, thermionic emission includes the emission of ions, but this process is quite different from that normally understood by the term. Thermionic emitters are used as cathodes in electron tubes and hence are of great technical and scientific importance.
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The Emission of Negative Ions from Oxide Coated Cathodes R H Sloane and C S Watt-Reversible poisoning by sulphur, oxygen and other gases of oxide-coated cathodes at high temperatures N A Surplice-Recent citations Emission of negative ions of oxygen from dispenser cathodes Part 1.
- Cathodes of barium oxide in sintered nickel N A Surplice-Reversible poisoning by sulphur, oxygen and other gases of oxide-coated cathodes. Negative Ion Emission from Oxide-Coated Cathodes: II case of the second tube the condition for direction focusing is that the ion source (the cathode), the centre of curvature of the magnetic field, and the collector slit should be collinear (Inghram ).
The collector consisted of a Faraday cylinder connected by a short lead to. The emission of negative ions from oxide coated cathodes and, in order to eliminate any possible potential drop along the Aquadag between the source and the collecting slits, S, was connected metallically to S.
After assembly the tube was degassed for several hours in a furnace under vacuum. EMISSION OF NEGATIVE IONS OF OXYGEN DURING THE ACTIVATION OF OXIDE-COATED CATHODES mercury when the tube was sealed off; the mass spectrum never included any COT and only once showed any trace of CO. Experimental results Bmission of oxygen as negative ions.
Each cathode was activated by drawing electron current from it to themodulator,Cited by: 3. B is the guard electrode with an adjacent tungsten filament F. oxide-coated cathodes.
Johnson concludes from his data that when he subtracts "enhanced thermionic emission" from the total electron current, the secondary emission does not increase with by: 8. The paper is the first of a series dealing experimentally with various aspects of the conductivity of oxide cathodes.
The present Part starts with a brief survey of existing knowledge and then proceeds to examine Emission of negative ions from oxide-coated cathodes. book practical circumstances under which a non-uniformity of potential gradient can arise across the matrix under a modest continuous current by: 1.
A study of the influence of various gases on the emission of oxide‐coated cathodes is described. Particularly selected were SO 2 and NO 2, which are closely related to air pollution, and Cl 2 gases.
For comparison purposes, the poisonous effects of N 2, CO 2, H 2 O, O 2, CO, H 2, and Ar, which are the main components of natural atmosphere, were also examined.
To study the influences of Cited by: (Calorimetric determination of work function of oxide coated platinum.) Google Scholar Crossref H. Spanner, Ann.
Phy (). (Conductivity and thermionic emission of BaO, SrO and CaO.), (Negative ion emission from oxide cathodes.), Cited by: The secondary electron emission from alkaline-earth oxide-coated cathodes has been investigated under both continuous and pulsed bombardment.
Various factors affecting the yield, such as dependence upon primary voltage, collecting voltage, temperature, time, and angle of incidence, are noted, and the present state of the theory is ments have been performed with three types of Cited by: 8.
A negative value for the complete expression implies that the electron current OXIDE COATED CATHODES 51 tends t o f o from the metal to the semiconductor at the hot junction. lw The temperature dependence in this expression is determined by the relative magnitudes of the two terms in the bracket, eq.
(26), the former causing the value to become Cited by: The mechanism of reduction of electron emission from oxide-coated cathodes by oxygen, and the recovery process after oxygen poisoning, have been studied using mass spectrometer techniques, showing that the formation of singly charged oxygen ions in the cathode coating plays a major part in the recovery process.
In tubes with oxide cathodes, grids may be tungsten or molybdenum wire structures, coated with gold to reduce primary emission caused by deposition of material evaporated from the cathode during operation.
In tubes with thoriated tungsten cathodes, grids may be made of tungsten or molybdenum coated with proprietary compounds to reduce primary emission.
Full text of "Effect of oxide-coated cathode temperature variation in When the SrO negative ions are liberated by the electron beam energy they react easily to form compounds with the layer of f* -f* Ba -Sr reducing the activity of the cathode surface layer.
from Oxide-Coated Cathodes", Jour, of Appl. Phys.,No 1., p Audio Books & Poetry Community Audio Computers, Technology and Science Music, Arts & Culture News & Public Affairs Non-English Audio Spirituality & Religion. Librivox Free Audiobook. CFC Couple Fun Chat Ambient podcasts AP.
Full text of "The Oxide Coated Cathode (G. Hermann. Metal oxide coated cathode materials for Li ion batteries – A review. Author links open overlay panel M.K.
Shobana. electrons cross from the negative to the positive terminal, generating an electrical energy. the fabrication of 3D self-supported metal oxides as cathodes for Li-ion is still a Cited by: 7. The base metal of the oxide-coated cathode.
On the discharge of negative ions by glowing metallic oxides, and allied phenomena Sc and Ba, and electron emission of cathodes. The life model for uncoated and coated (with osmium, indium film or film made from their alloys with refractory metals) thermionic dispenser cathodes has been developed based on the study of.
For oxide coated cathodes operated without current drain the thermionic emission as measured by pulse means is observed to correlate with the rate of reduction of the coating. The present paper describes a detailed study of negative ion emission processes from oxide cathodes during all stages of cathode life, using two types of mass spectrometer having oxide cathode.
Electron emission from sharp points in liquid argon of chemical agents of the gas phase on the emission of oxide-coated cathodes, a detailed study was made of the effects of ion bombardment by.
The safety and feasibility of industrial electrochemical production of sodium chlorate, an important chemical in the pulp and paper industry, depend on the selectivity of the electrode processes. The cathodic reduction of anodic products is sufficiently suppressed in the current technology by the addition of chromium(VI) to the electrolyte, but due to the high toxicity of these compounds Cited by: 1.The experimental work described here proves that a barium-strontium-oxide matrix is thermally unstable at °K and continuously generates negative ions of oxygen in its hollow pore system.
The barium-oxide component of the matrix is essentially stable and the strontium-oxide component is the oxygen-ion generator. The action is a fundamental one and proceeds at constant and unalterable : G.H. Metson.Magnetron and Penning ion sources have a long history going back to the early part of the 20 th century.
Their use for negative ion production off in s Soviet Russia with the really took introduction of ted magnetron and Penning negative ion sources .