Results 201 to 210 of about 1,018,400 (245)
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Thermionic Emission Constants and Band Overlap
Proceedings of the Physical Society, 1948A 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 Emission of Thoriated Tungsten
The Journal of Chemical Physics, 1958Methods were developed for quantitative chemical analysis of those constituents of thoriated tungsten filaments, both uncarbonized and carbonized, which are significant for thermionic emission. Sensitivity was adequate for analysis of an individual filament; therefore the composition of each filament could be correlated with both its thermionic ...
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Thermionic emission properties of hexaborides
Surface Science Letters, 1980Abstract Thermionic emission properties of the single crystal hexaborides LaB6, CeB6, PrB6, NdB6, SmB6, EuB6, (La, Sr)B6, (La, Ba)B6, (La, Ce)B6, (La, Pr)B6, (La, Sm)B6, and (La, Dy)B6 are measured in the temperature range between 1250 and 1700°C.
M. Futamoto, M. Nakazawa, U. Kawabe
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Automatic Regulation of Thermionic Emission
Journal of Scientific Instruments, 1950A 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 Constants and Their Interpretation
Journal of Applied Physics, 1961A critical review of the procedures used in the measurement and interpretation of thermionic emission with particular reference to nonmetallic cathodes is presented. Definitions are proposed for the terms ``true work function,'' ``effective work function,'' and ``Richardson work function.'' The use of Schottky plots is criticized and the advantages of ...
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Thermionic emission from carbon
Proceedings of the Physical Society, 1938Observations of the thermionic emission from a carefully outgassed filament of graphitic carbon were made at a series of temperatures between 1665° and 2191° K. The corresponding values of the constants A and ψ in the empirical emission formula i = AT2exp(-ψ/kT) were found to be 30 amp./cm.2-deg.2 and 4.34 eV. respectively.
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Thermionic emission of the GaAs photocathode
Solid-State Electronics, 1969Abstract The sources of thermionic emission (dark current) from the GaAs/CsO type of photocathode are considered. It is shown that for boat-grown GaAs the dominant emission components are likely to be due to generation of electron-hole pairs, at trapping centers in the band-bending region or via surface states.
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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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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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