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Thermionic emission controller with PID algorithm
2016 MIXDES - 23rd International Conference Mixed Design of Integrated Circuits and Systems, 2016The reported digital thermionic emission current controllers use floating voltage sources which produce noise current and consequently decrease the quality of an electron beam. The implementation of digital control in an electron source biasing system without floating sources gives the average value of the electron emission current standard deviation ...
Bartosz Kania, Jaroslaw Sikora
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LASER-INDUCED THERMIONIC EMISSION
Applied Physics Letters, 1963An experiment in which the electron emission signal resulting from the interacti on of a ruby laser beam with thoriated W was found to be related to thermionlc emission from W is described. Theoretical expressions relating the electron emission to the thermionic emission gave good agreement with experimental results. (D.C.W.)
C. M. Verber, A. H. Adelman
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Surface structure of thermionic-emission cathodes
Physical Review Letters, 1987We have used surface extended x-ray absorption fine structure (SEXAFS) to study the local geometry around barium atoms on thermionic cathodes. On the surfaces of tungsten and tungsten-osmium alloy dispenser cathodes Ba is bonded to oxygen with a well-defined short-range order.
, Norman +7 more
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Alternatives to thermionic emission
British Journal of Applied Physics, 1965The main fields of application of thermionic emission are analysed with a view to determining possible advantages of finding alternative approaches. For this purpose a distinction is made between applications where the emitted electrons are employed to transport charge and applications where they are used to transport and convert energy.
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Bell System Technical Journal, 1935
There have appeared in the Reviews of Modem Physics two excellent summaries on thermionic emission, one by Compton and Langmuir1 and one by Dushman.2 Compton and Lan gmuir, while dealing primarily with discharge in gases, also discussed many phases of thermionic emission. Dushman's article is a comprehensive review on thermionics.
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There have appeared in the Reviews of Modem Physics two excellent summaries on thermionic emission, one by Compton and Langmuir1 and one by Dushman.2 Compton and Lan gmuir, while dealing primarily with discharge in gases, also discussed many phases of thermionic emission. Dushman's article is a comprehensive review on thermionics.
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Surface Science Letters, 1982
Abstract A comprehensive theory of thermionic emission from clean metal surfaces is presented. The theory takes into account the energy band structure of the metal, inelastic scattering due to electron-electron collisions and the thermal vibration of the atoms. We applied the theory to thermionic emission from Cu(100).
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Abstract A comprehensive theory of thermionic emission from clean metal surfaces is presented. The theory takes into account the energy band structure of the metal, inelastic scattering due to electron-electron collisions and the thermal vibration of the atoms. We applied the theory to thermionic emission from Cu(100).
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New Thermionic Emission Microscope
Review of Scientific Instruments, 1966A new thermionic emission microscope has been designed and constructed. It is a two lens microscope having a combination electrostatic-electromagnetic objective lens and an electromagnetic projector lens. The microscope has a magnification range of 78 to 5600× and a resolution of about 500 Å which is independent of magnification.
E. Eichen, R. L. Forgacs, B. A. Parafin
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Thermionic Emission into Dielectric Liquids
Physical Review, 1937The presence of thermionic emission at ordinary temperatures for cathodes in contact with dielectric liquids is demonstrated. The current voltage relation is shown to obey the law $I={I}_{0}{e}^{(\frac{\ensuremath{\epsilon}{(\ensuremath{\epsilon}FD)}^{\frac{1}{2}}}{\mathrm{kT}})}$, where $I$ is the current, $F$ the field, and $D$ the dielectric ...
Edward B. Baker, Howard A. Boltz
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Equations for Thermionic Emission
Nature, 1926IN 1923, S. Dushman developed a general equation for thermionic emission, in agreement with the hitherto less frequently used one of the two equations suggested by O. W. Richardson, namely, when i = thermionic current in amp./cm.2. T = absolute temperature. b = constant for the substance. A = a universal constant.
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Thermionic emission from the fullerenes
Zeitschrift für Physik D Atoms, Molecules and Clusters, 1992Delayed ionisation of the fullerenes is reported over a timescale of up to 16 µs and compared to the Klots' model for thermionic emission [1]. The laser fluence dependence of the observed time constants for ionisation and the measured dependence on cluster size are in good agreement with model predictions giving strong evidence for the thermionic ...
E. E. B. Campbell +2 more
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