Results 191 to 200 of about 22,253 (240)

Thermionic emission from photocathodes

Journal of Physics D: Applied Physics, 1972
Accurate measurements of the Richardson workfunction R and the effective workfunction E have been made for the thermionic emission from K2CsSb bialkali and extended red-sensitive trialkali photocathodes. The sources of error in this type of experiment with photomultipliers, and the experimental and analytical techniques required to minimize these, are ...
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Thermionic emission galvanomagnetic effect

Technical Physics Letters, 1998
Experiments are described which permit the existence of an appreciable thermionic emission current from a photocathode to be established and the dependence of the thermionic emission current density of the cathode on the temperature, magnetic field, and current passed through the photocathode to be measured.
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Thermionic emission from giant fullerenes

Zeitschrift für Physik D Atoms, Molecules and Clusters, 1991
Large even-numbered carbon clusters in the size range from 100 to 600 atoms (giant fullerenes) were generated by laser vaporization and directly injected as positive ions via a supersonic beam into the magnetic trap of an ion cyclotron resonance apparatus.
S. Maruyama, M. Y. Lee, R. E. Haufler, Y. Chai, R. E. Smalley   +4 more
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Thermionic Emission Constants and Band Overlap

Proceedings of the Physical Society, 1948
A general treatment is given of the effect of band overlap on thermionic emission. The results are applied to nickel, for which the experimental value of the current constant A of 1380 amp. cm-2 deg-2 differs markedly from the standard value of 120 amp. cm-2 deg-2.
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Thermionic Field Emission Gun

1978
Abstract : Results are presented for a program to validate the technology for thermionic field emission (TF) guns. TF guns are proposed as an attractive alternate to cold cathode guns as high average and high peak current density excitation sources for repetitively pulsed short wavelength lasers.
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Thermionic emission from electron traps

Vacuum, 1972
Abstract Electron emission from traps filled by previous irradiation (exoelectron emission) is described in terms of thermionic emission from a surface layer of definite depth (isolated box model). From the kinetic equations a “thermionic range” is derived which is a common measure for the increasing temperature promoting the emission and the ...
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Automatic Regulation of Thermionic Emission

Journal of Scientific Instruments, 1950
A circuit is described which automatically controls the emission of thermionic devices for large changes of emission characteristics, and is also independent of large mains voltage fluctuations. In this circuit the power required to heat the emissive surface is controlled by two valves which have the two primary windings of the filament transformer as ...
W Steckelmacher, S van der Meer
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Thermionic emission from nanocrystalline cathodes

Technical Physics Letters, 2006
In recent years, much attention has been devoted to nanostructural systems, which exhibit unique physical properties. The most important tasks in the physics of nanostructures are (i) the development of special theoretical methods, (ii) investigations into the quantum and mesoscopic properties, (iii) the modeling of physical processes, (iv) analysis of
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Thermionic emission from dispenser cathodes

International Journal of Electronics, 1985
ABSTRACT The invalidity of the classical dipole theory as an emission mechanism for dispenser cathodes is discussed. A model of dynamic surface emission centres, proposed for explaining the observed phenomena in oxide cathodes, is extended to describe the thermionic emission from dispenser cathodes.
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Thermionic Emission

Reviews of Modern Physics, 1949
Conyers Herring, M. H. Nichols
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