Journal ArticleDOI
Charging Dynamics of Dielectrics Irradiated by Low Energy Electrons
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TLDR
In this article, the secondary electron emission (SEE) yield curve and the energy distribution of the secondaries were used to predict the voltage builtup or decay and the corresponding charging currents under various initial potential conditions of the dielectric.Abstract:
A recent study by Gross et al. showed the possibility of positive charging of dielectric materials by low energy electron irradiation. In this paper we model the charging process allowing us to predict the voltage builtup or decay and the corresponding charging currents under various initial potential conditions of the dielectric. The model incorporates the secondary electron emission (SEE) yield curve and the energy distribution of the secondaries. The energy distribution is essential to obtain the correct charging behavior for beam energies smaller than the second crossover energy of the SEE yield curve. The results agree, in general, with experimental data Further it is shown theoretically that knowledge of the charging current and the corresponding voltage behavior of an irradiated sample can be utilized to determine the secondary electron yield curve for dielectrics and conductors.read more
Citations
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Journal ArticleDOI
Secondary electron emission from dielectric materials of a Hall thruster with segmented electrodes
TL;DR: In this article, the secondary electron discharge parameters in Hall thrusters depend strongly on the yield of secondary electron emission from channel walls and the observed differences might be caused by electron backscattering which is dominant at lower energies and depends strongly on surface properties.
Journal ArticleDOI
Electrets: Dielectrics with Quasi-Permanent Charge or Polarization
TL;DR: A review of very recent electret work can be found in this paper, where a history-oriented introduction refers to important early studies of charge storage in insulators; a number of relevant surveys are listed for further information on previous electret research.
Journal ArticleDOI
Electron-beam poling of piezoelectric polymer electrets
TL;DR: In this article, the authors demonstrated that the thickness of the unpoled sample volume is proportional to the 1.5th power of the electron energy used and proposed a method for fabrication of polymer electrets with a polarization zone of predetermined thickness for flexure mode devices.
Journal ArticleDOI
Secondary electron emission of an insulating target induced by a well-focused electron beam – Monte Carlo simulation study
TL;DR: In this article, a Monte Carlo simulation of the electron trajectories where the trace of all the charge carriers implied in the interaction of the electronic beam with the insulator can be followed was developed.
Journal ArticleDOI
Charging and charge compensation in AES analysis of insulators
TL;DR: In this paper, the basic principles of charging and its effect on qualitative and quantitative AES are described, such as reducing the primary current density, minimizing the absorbed current path, and increasing the total secondary electron emission.
References
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Journal ArticleDOI
Secondary electron emission in the scanning electron microscope
TL;DR: In this article, the secondary electron emission of surfaces bombarded by primary electrons with respect to scanning electron microscopy is surveyed and different detectors for secondary electrons in the scanning electron microscope, material, topography, voltage, magnetic, and crystallographic orientation contrast, as well as the lateral resolution, depending among other things on the spatial distribution of the emitted secondary electrons, are discussed.
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Measurement of potential buildup and decay, surface charge density, and charging currents of corona‐charged polymer foil electrets
R. A. Moreno,B. Gross +1 more
TL;DR: In this paper, the authors describe a technique which determines charges, currents, and potentials during the charging process of corona-charged polymer foil electrets, and apply it to Teflon and polyethylene foils.
Journal ArticleDOI
Charging of polymer foils with monoenergetic low‐energy electron beams
Gerhard M. Sessler,James E. West +1 more
TL;DR: In this article, results of charge deposition on 12.7 and 25.4μm polymer foils with 10 to 40-keV monoenergetic electron beams are reported.
Journal ArticleDOI
A new model of isothermal charge transport for negatively corona-charged Teflon
TL;DR: In this paper, the authors studied the transport of electrons in Teflon FEP type A under isothermal conditions (145°C) in open circuit and suggested a theoretical model including surface, shallow, and deep traps.
Journal ArticleDOI
Positive charging of fluorinated ethylene propylene copolymer (Teflon) by irradiation with low‐energy electrons
TL;DR: In this paper, the number of secondary and backscattered primary electrons is increased with decreasing primary energy, and holes are generated in the surface region of an insulating dielectric positively by negatively biasing the metallized rear during charging and subsequent discharging of the rear electrode after irradiation.