About: Some Properties of Field ion Emission from SiO2 Grains

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An Entity of Type : http://linked.opendata.cz/ontology/domain/vavai/Vysledek, within Data Space : linked.opendata.cz associated with source document(s)

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://www.mff.cuni.cz/veda/konference/wds/proc/pdf12/WDS12_226_f2_Vysinka.pdf
Description	Probably the most abundant dust in space constitutes silicates. When the dust grain is exposed to energetic electron or ion beams it can attain a large surface potential which is limited by field ion emission. It is generally expected that the field ion emission is controlled by the surface electric field, and pressure and composition of the ambient atmosphere. In our study, we have used spherical glass dust grains with diameters around 1 micron charged to several kV. Such charging creates the electric field in the range of 109 V/m leading to observable field ion emission. A positive charge of the dust grain can be reached not only by ion bombardment but, under some circumstances, by electrons as well. Contrary to the expectations, when charged by electrons, the discharging characteristics depends on the obtained specific charge, the energy of impinging electrons and charging current density. Moreover the discharging shows an increase of the discharging current in the beginning. We show that such behavior is caused by diffusion of positive holes inside the grain through the influence of an inner electric field and enhanced temperature. Probably the most abundant dust in space constitutes silicates. When the dust grain is exposed to energetic electron or ion beams it can attain a large surface potential which is limited by field ion emission. It is generally expected that the field ion emission is controlled by the surface electric field, and pressure and composition of the ambient atmosphere. In our study, we have used spherical glass dust grains with diameters around 1 micron charged to several kV. Such charging creates the electric field in the range of 109 V/m leading to observable field ion emission. A positive charge of the dust grain can be reached not only by ion bombardment but, under some circumstances, by electrons as well. Contrary to the expectations, when charged by electrons, the discharging characteristics depends on the obtained specific charge, the energy of impinging electrons and charging current density. Moreover the discharging shows an increase of the discharging current in the beginning. We show that such behavior is caused by diffusion of positive holes inside the grain through the influence of an inner electric field and enhanced temperature. (en)
Title	Some Properties of Field ion Emission from SiO2 Grains Some Properties of Field ion Emission from SiO2 Grains (en)
skos:prefLabel	Some Properties of Field ion Emission from SiO2 Grains Some Properties of Field ion Emission from SiO2 Grains (en)
skos:notation	RIV/00216208:11320/12:10133186!RIV13-MSM-11320___
http://linked.open...avai/predkladatel	Matematicko-fyzikální fakulta
http://linked.open...avai/riv/aktivita	S
http://linked.open...avai/riv/aktivity	S
http://linked.open...vai/riv/dodaniDat	2013
http://linked.open...aciTvurceVysledku	Šafránková, Jana Pavlů, Jiří Vyšinka, Marek Vaverka, Jakub Němeček, Zdeněk
http://linked.open.../riv/druhVysledku	D - Článek ve sborníku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Karlova v Praze / Matematicko-fyzikální fakulta
http://linked.open...dnocenehoVysledku	169221
http://linked.open...ai/riv/idVysledku	RIV/00216208:11320/12:10133186
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Field ion emission; Surface potential; Dust (en)
http://linked.open.../riv/klicoveSlovo	Dust Field ion emission Surface potential
http://linked.open...ontrolniKodProRIV	[F7366A0EDB85]
http://linked.open...v/mistoKonaniAkce	Praha
http://linked.open...i/riv/mistoVydani	Praha
http://linked.open...i/riv/nazevZdroje	WDS'12 Proceedings of Contributed Papers: Part II - Physics of Plasmas and Ionized Media
http://linked.open...in/vavai/riv/obor	BL
http://linked.open...ichTvurcuVysledku	5 (xsd:int)
http://linked.open...cetTvurcuVysledku	5 (xsd:int)
http://linked.open...UplatneniVysledku	2012
http://linked.open...iv/tvurceVysledku	Němeček, Zdeněk Pavlů, Jiří Vaverka, Jakub Vyšinka, Marek Šafránková, Jana
http://linked.open...vavai/riv/typAkce	EUR - Evropská
http://linked.open.../riv/zahajeniAkce	2012-05-29 (xsd:date)
number of pages	5 (xsd:int)
http://purl.org/ne...btex#hasPublisher	Matfyzpress
https://schema.org/isbn	978-80-7378-225-2
http://localhost/t...ganizacniJednotka	11320
is http://linked.open...avai/riv/vysledek of	Some Properties of Field ion Emission from SiO2 Grains

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